feat: use comment to advise how to fix

Closes #2

Author: z0al

lib/format.js

@@ -1,7 +1,7 @@
 /**
  * Formats commitlint report as GitHub status report
- * 
- * @param {Object} report 
+ *
+ * @param {Object} report
  */
 const format = report => {
 	const { commits } = report
@@ -29,7 +29,17 @@ const format = report => {
 	// Summary
 	const summary = `found ${errorsCount} problems, ${warnsCount} warnings`
 	if (errorsCount > 0 || warnsCount > 0) {
-		message = `There were the following issues with this Pull Request\n${message}`
+		message = `
+There were the following issues with this Pull Request
+
+${message}
+
+You may need to [change the commit messages](https://help.github.com/articles/changing-a-commit-message/) to comply with the repository contributing guidelines.
+
+--------
+
+:robot:  This comment is autogenerated. If you noticed some issues please report them [here](https://github.com/ahmed-taj/commitlint-bot). Happy coding!
+`
 	}
 	return { summary, message }
 }