Delete note about upstreaming keyword patterns

Now that the author of Deoplete.nvim made it clear[1] that he is not interested in accepting and including default keyword patterns  for languages in Deoplete.nvim, delete the note.

[1] Shougo/deoplete.nvim#1015

Author: finalfantasia

README.md

@@ -2,6 +2,7 @@
 
 Provides async clojure completion for:
 
+* [deoplete.nvim][]
 * [ncm2][]
 * [asyncomplete.vim][]
 * [coc.nvim][]
@@ -31,9 +32,6 @@ You also need to include the following line in your init.vim:
 call deoplete#custom#option('keyword_patterns', {'clojure': '[\w!$%&*+/:<=>?@\^_~\-\.#]*'})
 ```
 
-As I improve them, they may be PR'd into deoplete.vim, but I'm not yet
-comfortable suggesting that change upstream.
-
 ### Nvim Completion Manager 2
 
 1. Follow the install instructions for [ncm2][].