Return the commit message for the current commit hash,
        replace #<PRID> with GH-<PRID>

def get_commit_message(self, commit_sha):
        """
        Return the commit message for the current commit hash,
        replace #<PRID> with GH-<PRID>
        """
        cmd = ["git", "show", "-s", "--format=%B", commit_sha]
        output = subprocess.check_output(cmd, stderr=subprocess.STDOUT)
        message = output.strip().decode("utf-8")
        if self.config["fix_commit_msg"]:
            return message.replace("#", "GH-")
        else:
            return message