completion: complete remote names too

"git remote update" accepts both groups and single remotes.

Signed-off-by: Łukasz Stelmach <[email protected]>
Reviewed-by: Nguyễn Thái Ngọc Duy <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: Łukasz Stelmach

contrib/completion/git-completion.bash

@@ -2631,7 +2631,7 @@ _git_remote ()
 		__gitcomp_builtin remote_update
 		;;
 	update,*)
-		__gitcomp "$(__git_get_config_variables "remotes")"
+		__gitcomp "$(__git_remotes) $(__git_get_config_variables "remotes")"
 		;;
 	set-url,--*)
 		__gitcomp_builtin remote_set-url