Merge pull request tree-sitter#346 from Razzeee/patch-1

Add elm tree sitter

Author: maxbrunsfeld

docs/index.md

@@ -30,6 +30,7 @@ Parsers for these languages are fairly complete:
 * [C](https://github.com/tree-sitter/tree-sitter-c)
 * [C++](https://github.com/tree-sitter/tree-sitter-cpp)
 * [CSS](https://github.com/tree-sitter/tree-sitter-css)
+* [Elm](https://github.com/razzeee/tree-sitter-elm)
 * [ERB / EJS](https://github.com/tree-sitter/tree-sitter-embedded-template)
 * [Go](https://github.com/tree-sitter/tree-sitter-go)
 * [HTML](https://github.com/tree-sitter/tree-sitter-html)