add linguist to readme

Author: joshraphael

README.md

@@ -21,4 +21,5 @@ Grab the latest generated files on the [release](https://github.com/joshraphael/
 - [vscode-rascript](https://github.com/joshraphael/vscode-rascript) - VSCode language client for RAScript.
 - [sublime-rascript](https://github.com/joshraphael/sublime-rascript) - SublimeText language client for RAScript.
 - [npp-rascript](https://github.com/joshraphael/npp-rascript) - Notepad++ language client for RAScript.
-- [highlightjs-rascript](https://github.com/joshraphael/highlightjs-rascript) - highlight.js grammar definition for RAScript.
+- [highlightjs-rascript](https://github.com/joshraphael/highlightjs-rascript) - highlight.js grammar definition for RAScript.
+- [linguist](https://github.com/github-linguist/linguist) - Github language detection library.