Add the 'autocmd!' command to clean the autocmd in the group

This will prevent to add the already loaded autocmd when reloading the
vim configuration. The 'autocmd!' command remove the content of the
augroup at load.

Author: mdedonno1337

snippets/vim.snippets

@@ -43,6 +43,7 @@ snippet ife if ... else statement
 	endif
 snippet au augroup ... autocmd block
 	augroup ${1:AU_NAME}
+		autocmd!
 		autocmd ${2:BufRead,BufNewFile} ${3:*.ext,*.ext3|<buffer[=N]>} ${0}
 	augroup END
 snippet auv augroupvisual ... autocmd block with visual placeholder