code: def get_commit_message(self, commit_sha):
          
          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
docs: Return the commit message for the current commit hash,
          replace #<PRID> with GH-<PRID>