Support git versions that don't recognize --no-verbose

git/git.go

@@ -358,6 +358,10 @@ func gitCmd(args ...string) *cmd.Cmd {
 
 func IsBuiltInGitCommand(command string) bool {
 	helpCommandOutput, err := gitOutput("help", "--no-verbose", "-a")
+	if err != nil {
+		// support git versions that don't recognize --no-verbose
+		helpCommandOutput, err = gitOutput("help", "-a")
+	}
 	if err != nil {
 		return false
 	}