Add sublime-rust to CONFIGS.md.

Author: terrynsun

src/etc/CONFIGS.md

@@ -6,6 +6,7 @@ These are some links to repos with configs which ease the use of rust.
 
 * [rust.vim](https://github.com/rust-lang/rust.vim)
 * [emacs rust-mode](https://github.com/rust-lang/rust-mode)
+* [sublime-rust](https://github.com/rust-lang/sublime-rust)
 * [gedit-config](https://github.com/rust-lang/gedit-config)
 * [kate-config](https://github.com/rust-lang/kate-config)
 * [nano-config](https://github.com/rust-lang/nano-config)