Enable spell checking for git commit messages in .vimrc

.vimrc

@@ -45,3 +45,5 @@ inoremap <Down> <nop>
 iabbrev ret return
 iabbrev @@ frans@tankernn.eu
 iabbrev ssig -- <cr>Frans Bergman<cr>frans@tankernn.eu
+
+autocmd FileType gitcommit :set spell