chore: highlight breaking Twilio CLI change

The new version of the plugin-serverless and plugin-assets are only compatible with Twilio CLI 3.0
or newer.

BREAKING CHANGE: New version requires Twilio CLI 3.0 or newer

Author: dkundel

Diff for: packages/plugin-assets/README.md

@@ -10,6 +10,8 @@ The plugin creates a new Runtime Service which it then uses as a bucket to which
 
 For more information see the blog post [announcing the the Assets Plugin](https://www.twilio.com/blog/assets-plugin-twilio-cli) and an example of [how to upload audio files for your Studio IVR with the Assets Plugin](https://www.twilio.com/blog/upload-audio-files-studio-ivr-twilio-cli-assets-plugin).
 
+> **Important**: This version requires Twilio CLI version 3.0 or newer. For Twilio CLI version 2.x you have to use plugin-assets version 1.2.6.
+
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Diff for: packages/plugin-serverless/README.md

@@ -7,6 +7,8 @@
 This plugin adds functionality to the [Twilio CLI](https://github.com/twilio/twilio-cli) to locally develop,
 debug and deploy to Twilio Serverless. It's a part of the [Serverless Toolkit](https://github.com/twilio-labs/serverless-toolkit) and wraps [twilio-run](https://github.com/twilio-labs/twilio-run) and [create-twilio-function](https://github.com/philnash/create-twilio-function).
 
+> **Important**: This version requires Twilio CLI version 3.0 or newer. For Twilio CLI version 2.x you have to use plugin-serverless version 2.4.
+
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