vim: force gitsendemail format on patch files
vim: force gitsendemail format on patch files

since gitsendemail is the same as diff but with more
coloring, use it as a default

Signed-off-by: Liam Beguin <ac8b122174024ef5e58ca7d6d989651e9bbfc948@gmail.com>

Liambeguin/dotfiles,Liambeguin/dotfiles