Prevents action to fail if no events found

[Kanna727]

fixes #46

[PuneetGopinath]

The workflow will run successfully if you change

    if (!content.length) {
      tools.exit.success("No PullRequest/Issue/IssueComment events found. Leaving README unchanged with previous activity");
    }

to

    if (!content.length) {
      tools.exit.success(
        "No PullRequest/Issue/IssueComment events found. Leaving README unchanged with previous activity"
      );
    }