Update README sponsors/backers (#4605) [ci skip]

Author: juergba

README.md

@@ -9,8 +9,8 @@
 <a href="https://coveralls.io/github/mochajs/mocha"><img src="https://coveralls.io/repos/github/mochajs/mocha/badge.svg" alt="Coverage Status"></a>
 <a href="https://app.fossa.io/projects/git%2Bhttps%3A%2F%2Fgithub.com%2Fmochajs%2Fmocha?ref=badge_shield"><img src="https://app.fossa.io/api/projects/git%2Bhttps%3A%2F%2Fgithub.com%2Fmochajs%2Fmocha.svg?type=shield" alt="FOSSA Status"></a>
 <a href="https://gitter.im/mochajs/mocha?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge"><img src="https://badges.gitter.im/Join%20Chat.svg" alt="Gitter"></a>
-<a href="https://github.com/mochajs/mocha#backers"><img src="https://opencollective.com/mochajs/backers/badge.svg" alt="OpenCollective"></a>
-<a href="https://github.com/mochajs/mocha#sponsors"><img src="https://opencollective.com/mochajs/sponsors/badge.svg" alt="OpenCollective"></a>
+<a href="https://github.com/mochajs/mocha#sponsors"><img src="https://opencollective.com/mochajs/tiers/sponsors/badge.svg" alt="OpenCollective"></a>
+<a href="https://github.com/mochajs/mocha#backers"><img src="https://opencollective.com/mochajs/tiers/backers/badge.svg" alt="OpenCollective"></a>
 </p>
 
 <p align="center">
@@ -27,74 +27,28 @@
 - [Code of Conduct](https://github.com/mochajs/mocha/blob/master/.github/CODE_OF_CONDUCT.md)
 - [Contributing](https://github.com/mochajs/mocha/blob/master/.github/CONTRIBUTING.md)
 - [Gitter Chatroom](https://gitter.im/mochajs/mocha) (ask questions here!)
-- [Google Group](https://groups.google.com/group/mochajs)
 - [Issue Tracker](https://github.com/mochajs/mocha/issues)
 
 ## Backers
 
-[Become a backer](https://opencollective.com/mochajs#backer) and show your support to our open source project.
-
-[![MochaJS Backer](https://opencollective.com/mochajs/backer/0/avatar)](https://opencollective.com/mochajs/backer/0/website)
-[![MochaJS Backer](https://opencollective.com/mochajs/backer/1/avatar)](https://opencollective.com/mochajs/backer/1/website)
-[![MochaJS Backer](https://opencollective.com/mochajs/backer/2/avatar)](https://opencollective.com/mochajs/backer/2/website)
-[![MochaJS Backer](https://opencollective.com/mochajs/backer/3/avatar)](https://opencollective.com/mochajs/backer/3/website)
-[![MochaJS Backer](https://opencollective.com/mochajs/backer/4/avatar)](https://opencollective.com/mochajs/backer/4/website)
-[![MochaJS Backer](https://opencollective.com/mochajs/backer/5/avatar)](https://opencollective.com/mochajs/backer/5/website)
-[![MochaJS Backer](https://opencollective.com/mochajs/backer/6/avatar)](https://opencollective.com/mochajs/backer/6/website)
-[![MochaJS Backer](https://opencollective.com/mochajs/backer/7/avatar)](https://opencollective.com/mochajs/backer/7/website)
-[![MochaJS Backer](https://opencollective.com/mochajs/backer/8/avatar)](https://opencollective.com/mochajs/backer/8/website)
-[![MochaJS Backer](https://opencollective.com/mochajs/backer/9/avatar)](https://opencollective.com/mochajs/backer/9/website)
-[![MochaJS Backer](https://opencollective.com/mochajs/backer/10/avatar)](https://opencollective.com/mochajs/backer/10/website)
-[![MochaJS Backer](https://opencollective.com/mochajs/backer/11/avatar)](https://opencollective.com/mochajs/backer/11/website)
-[![MochaJS Backer](https://opencollective.com/mochajs/backer/12/avatar)](https://opencollective.com/mochajs/backer/12/website)
-[![MochaJS Backer](https://opencollective.com/mochajs/backer/13/avatar)](https://opencollective.com/mochajs/backer/13/website)
-[![MochaJS Backer](https://opencollective.com/mochajs/backer/14/avatar)](https://opencollective.com/mochajs/backer/14/website)
-[![MochaJS Backer](https://opencollective.com/mochajs/backer/15/avatar)](https://opencollective.com/mochajs/backer/15/website)
-[![MochaJS Backer](https://opencollective.com/mochajs/backer/16/avatar)](https://opencollective.com/mochajs/backer/16/website)
-[![MochaJS Backer](https://opencollective.com/mochajs/backer/17/avatar)](https://opencollective.com/mochajs/backer/17/website)
-[![MochaJS Backer](https://opencollective.com/mochajs/backer/18/avatar)](https://opencollective.com/mochajs/backer/18/website)
-[![MochaJS Backer](https://opencollective.com/mochajs/backer/19/avatar)](https://opencollective.com/mochajs/backer/19/website)
-[![MochaJS Backer](https://opencollective.com/mochajs/backer/20/avatar)](https://opencollective.com/mochajs/backer/20/website)
-[![MochaJS Backer](https://opencollective.com/mochajs/backer/21/avatar)](https://opencollective.com/mochajs/backer/21/website)
-[![MochaJS Backer](https://opencollective.com/mochajs/backer/22/avatar)](https://opencollective.com/mochajs/backer/22/website)
-[![MochaJS Backer](https://opencollective.com/mochajs/backer/23/avatar)](https://opencollective.com/mochajs/backer/23/website)
-[![MochaJS Backer](https://opencollective.com/mochajs/backer/24/avatar)](https://opencollective.com/mochajs/backer/24/website)
-[![MochaJS Backer](https://opencollective.com/mochajs/backer/25/avatar)](https://opencollective.com/mochajs/backer/25/website)
-[![MochaJS Backer](https://opencollective.com/mochajs/backer/26/avatar)](https://opencollective.com/mochajs/backer/26/website)
-[![MochaJS Backer](https://opencollective.com/mochajs/backer/27/avatar)](https://opencollective.com/mochajs/backer/27/website)
-[![MochaJS Backer](https://opencollective.com/mochajs/backer/28/avatar)](https://opencollective.com/mochajs/backer/28/website)
-[![MochaJS Backer](https://opencollective.com/mochajs/backer/29/avatar)](https://opencollective.com/mochajs/backer/29/website)
+[Become a backer](https://opencollective.com/mochajs) and show your support to our open source project on [our site](https://mochajs.org/#backers).
+
+<a href="https://opencollective.com/mochajs"><img src="https://opencollective.com/mochajs/tiers/backers.svg?limit=30&button=false&avatarHeight=46&width=750"></a>
 
 ## Sponsors
 
-Does your company use Mocha? Ask your manager or marketing team if your company would be interested in supporting our project. Support will allow the maintainers to dedicate more time for maintenance and new features for everyone. Also, your company's logo will show [on GitHub](https://github.com/mochajs/mocha#readme) and on [our site](https://mochajs.org) - who doesn't want a little extra exposure? [Here's the info](https://opencollective.com/mochajs#sponsor).
-
-[![MochaJS Sponsor](https://opencollective.com/mochajs/sponsor/0/avatar)](https://opencollective.com/mochajs/sponsor/0/website)
-[![MochaJS Sponsor](https://opencollective.com/mochajs/sponsor/1/avatar)](https://opencollective.com/mochajs/sponsor/1/website)
-[![MochaJS Sponsor](https://opencollective.com/mochajs/sponsor/2/avatar)](https://opencollective.com/mochajs/sponsor/2/website)
-[![MochaJS Sponsor](https://opencollective.com/mochajs/sponsor/3/avatar)](https://opencollective.com/mochajs/sponsor/3/website)
-[![MochaJS Sponsor](https://opencollective.com/mochajs/sponsor/4/avatar)](https://opencollective.com/mochajs/sponsor/4/website)
-[![MochaJS Sponsor](https://opencollective.com/mochajs/sponsor/5/avatar)](https://opencollective.com/mochajs/sponsor/5/website)
-[![MochaJS Sponsor](https://opencollective.com/mochajs/sponsor/6/avatar)](https://opencollective.com/mochajs/sponsor/6/website)
-[![MochaJS Sponsor](https://opencollective.com/mochajs/sponsor/7/avatar)](https://opencollective.com/mochajs/sponsor/7/website)
-[![MochaJS Sponsor](https://opencollective.com/mochajs/sponsor/8/avatar)](https://opencollective.com/mochajs/sponsor/8/website)
-[![MochaJS Sponsor](https://opencollective.com/mochajs/sponsor/9/avatar)](https://opencollective.com/mochajs/sponsor/9/website)
-[![MochaJS Sponsor](https://opencollective.com/mochajs/sponsor/10/avatar)](https://opencollective.com/mochajs/sponsor/10/website)
-[![MochaJS Sponsor](https://opencollective.com/mochajs/sponsor/11/avatar)](https://opencollective.com/mochajs/sponsor/11/website)
-[![MochaJS Sponsor](https://opencollective.com/mochajs/sponsor/12/avatar)](https://opencollective.com/mochajs/sponsor/12/website)
-[![MochaJS Sponsor](https://opencollective.com/mochajs/sponsor/13/avatar)](https://opencollective.com/mochajs/sponsor/13/website)
-[![MochaJS Sponsor](https://opencollective.com/mochajs/sponsor/14/avatar)](https://opencollective.com/mochajs/sponsor/14/website)
-[![MochaJS Sponsor](https://opencollective.com/mochajs/sponsor/15/avatar)](https://opencollective.com/mochajs/sponsor/15/website)
-[![MochaJS Sponsor](https://opencollective.com/mochajs/sponsor/16/avatar)](https://opencollective.com/mochajs/sponsor/16/website)
-[![MochaJS Sponsor](https://opencollective.com/mochajs/sponsor/17/avatar)](https://opencollective.com/mochajs/sponsor/17/website)
-[![MochaJS Sponsor](https://opencollective.com/mochajs/sponsor/18/avatar)](https://opencollective.com/mochajs/sponsor/18/website)
-[![MochaJS Sponsor](https://opencollective.com/mochajs/sponsor/19/avatar)](https://opencollective.com/mochajs/sponsor/19/website)
+Does your company use Mocha? Ask your manager or marketing team if your company would be interested in supporting our project. Support will allow the maintainers to dedicate more time for maintenance and new features for everyone. Also, your company's logo will show [on GitHub](https://github.com/mochajs/mocha#readme) and on [our site](https://mochajs.org#sponsors) - who doesn't want a little extra exposure? [Here's the info](https://opencollective.com/mochajs).
+
+[![MochaJS Sponsor](https://opencollective.com/mochajs/tiers/sponsors/0/avatar)](https://opencollective.com/mochajs/tiers/sponsors/0/website)
+[![MochaJS Sponsor](https://opencollective.com/mochajs/tiers/sponsors/1/avatar)](https://opencollective.com/mochajs/tiers/sponsors/1/website)
+[![MochaJS Sponsor](https://opencollective.com/mochajs/tiers/sponsors/2/avatar)](https://opencollective.com/mochajs/tiers/sponsors/2/website)
+[![MochaJS Sponsor](https://opencollective.com/mochajs/tiers/sponsors/3/avatar)](https://opencollective.com/mochajs/tiers/sponsors/3/website)
 
 ## Development
 
 You might want to know that:
 
-- Mocha is the _most-depended-upon_ module on npm (source: [libraries.io](https://libraries.io/search?order=desc&platforms=NPM&sort=dependents_count)), and
+- Mocha is one of the _most-depended-upon_ modules on npm (source: [libraries.io](https://libraries.io/search?order=desc&platforms=NPM&sort=dependents_count)), and
 - Mocha is an _independent_ open-source project, maintained exclusively by volunteers.
 
 You might want to help: