gitfast: fix the prompt colour

We can add colour in Zsh without the need of pcmode.
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>

plugins/gitfast/git-prompt.sh

@@ -502,10 +502,12 @@ __git_ps1 ()
 
 	local z="${GIT_PS1_STATESEPARATOR-" "}"
 
-	# NO color option unless in PROMPT_COMMAND mode
-	if [ $pcmode = yes ] && [ -n "${GIT_PS1_SHOWCOLORHINTS-}" ]; then
+	# NO color option unless in PROMPT_COMMAND mode or it's Zsh
+	if [ -n "${GIT_PS1_SHOWCOLORHINTS-}" ]; then
+		if [ $pcmode = yes ] || [ -n "${ZSH_VERSION-}" ]; then
 			__git_ps1_colorize_gitstring
 		fi
+	fi
 
 	b=${b##refs/heads/}
 	if [ $pcmode = yes ] && [ $ps1_expanded = yes ]; then