gitfast: update to upstream v2.0
gitfast: update to upstream v2.0

Signed-off-by: Felipe Contreras <de77a8b9cd239b204c19c52ed62e48ab47243362@gmail.com>

rakeshbala/oh-my-zsh,rakeshbala/oh-my-zsh,rakeshbala/oh-my-zsh,rakeshbala/oh-my-zsh