title: VIM set spell in file .git/COMMIT_EDITMSG
body: <p>I want to "set spell" automatically when i am editing the commit text in git. From the % I see that it is writing to a filename called  .git/COMMIT_EDITMSG.  How do I update my .vimrc to automatically set spell on when editing that file.
  something on the lines</p>
  
  <p>if ( filename has a word COMMIT)</p>
  
  <p>set spell</p>
  
  <p>fi</p>