vim-patch:7.4.568

Problem:    Giving an error for ":0wincmd w" is a problem for some
            plugins.
Solution:   Allow the zero in the range. (Marcin Szamotulski)

https://code.google.com/p/vim/source/detail?r=v7-4-568

src/nvim/version.c

@@ -211,7 +211,7 @@ static int included_patches[] = {
   //571 NA
   //570 NA
   //569,
-  //568,
+  568,
   567,
   566,
   565,