Indicate explicit Tailwind CSS version in README (#177)

* Indicate explicit Tailwind CSS version in README

* We're now up to 3.1

Co-authored-by: David Heinemeier Hansson <[email protected]>

Author: marcelkooi

README.md

@@ -2,7 +2,7 @@
 
 [Tailwind CSS](https://tailwindcss.com) is a utility-first CSS framework packed with classes like flex, pt-4, text-center and rotate-90 that can be composed to build any design, directly in your markup.
 
-This gem wraps [the standalone executable version](https://tailwindcss.com/blog/standalone-cli) of the Tailwind CSS 3 framework. These executables are platform specific, so there are actually separate underlying gems per platform, but the correct gem will automatically be picked for your platform. Supported platforms are Linux x64, macOS arm64, macOS x64, and Windows x64. (Note that due to this setup, you must install the actual gems – you can't pin your gem to the github repo.)
+This gem wraps [the standalone executable version](https://tailwindcss.com/blog/standalone-cli) of the Tailwind CSS v3 framework. These executables are platform specific, so there are actually separate underlying gems per platform, but the correct gem will automatically be picked for your platform. Supported platforms are Linux x64, macOS arm64, macOS x64, and Windows x64. (Note that due to this setup, you must install the actual gems – you can't pin your gem to the github repo.)
 
 You can customize the Tailwind build through the `config/tailwind.config.js` file, just like you would if Tailwind was running in a traditional node installation. All the first-party plugins are supported.