Update package.json repository -> rust-lang

Author: alexheretic

package.json

@@ -3,7 +3,7 @@
   "main": "./lib/index",
   "version": "0.19.0",
   "description": "Rust language support for Atom-IDE",
-  "repository": "https://github.com/mehcode/atom-ide-rust",
+  "repository": "https://github.com/rust-lang/atom-ide-rust",
   "license": "MIT",
   "keywords": [
     "rust",