Fix grammar

hail2u · hail2u · commit fbb5357a0e99 · 2015-12-08T17:31:43.000+09:00
diff --git a/README.md b/README.md
@@ -42,7 +42,7 @@ Or in your `~/.vimrc`:
       autocmd FileType css setlocal iskeyword+=-
     augroup END
 
-This setting have side effects, so use it at your own risk.
+This setting have side effects. So, use it at your own risk.
 
 
 ### Vendor Prefixes
