Add a non-master branch example

README.md

@@ -59,6 +59,9 @@ Plug 'tpope/vim-fireplace', { 'for': 'clojure' }
 " Using git URL
 Plug 'https://github.com/junegunn/vim-github-dashboard.git'
 
+" Using a non-master branch
+Plug 'rdnetto/YCM-Generator', { 'branch': 'stable' }
+
 " Plugin options
 Plug 'nsf/gocode', { 'tag': 'v.20150303', 'rtp': 'vim' }