Update textwidth and colorcolumn for git

Color a first column at 51 for subject with maximum 50 characters.
Color a second column at 72 characters for body content + wrap it.

vimrc

@@ -82,8 +82,8 @@ set encoding=utf-8
 set fileencoding=utf-8
 
 " Specific to git commit (COMMIT_EDITMSG) {{{
-autocmd Filetype gitcommit setlocal textwidth=50
-autocmd Filetype gitcommit setlocal colorcolumn=51
+autocmd Filetype gitcommit setlocal textwidth=72
+autocmd Filetype gitcommit setlocal colorcolumn=51,72
 " }}}
 
 " Path pour la recherche de fichier avec :find, :sfind et :tabfind