Update README

Author: ryyppy

README.md

@@ -55,7 +55,7 @@ NeoBundle 'rescript-lang/vim-rescript'
 You can also pin your installation to specific tags (check our releases [here](https://github.com/rescript-lang/vim-rescript/releases)):
 
 ```
-Plug 'rescript-lang/vim-rescript', {'tag': 'v2.0.1'}
+Plug 'rescript-lang/vim-rescript', {'tag': 'v2.1.0'}
 ```
 
 ## Using vim-rescript with COC