commit 6e7011712398e53671e5a44edefeb68914562a3a
Author: Hong Xu <hong@topbug.net>
Date:   Wed Apr 6 00:34:26 2016 -0700

    Support max_line_length=off to leave the decision to the editor settings.

diff --git a/plugin/editorconfig.vim b/plugin/editorconfig.vim
index 9abd008..0e9d647 100644
--- a/plugin/editorconfig.vim
+++ b/plugin/editorconfig.vim
@@ -563,7 +563,8 @@ function! s:ApplyConfig(config) " {{{1
     endif
 
     " highlight the columns following max_line_length
-    if has_key(a:config, 'max_line_length')
+    if has_key(a:config, 'max_line_length') &&
+                \ a:config['max_line_length'] != 'off'
         let l:max_line_length = str2nr(a:config['max_line_length'])
 
         if l:max_line_length >= 0