Change beginning/end of certificate check to make carriage returns optional

[bamill88]

Though I am using Windows, the certificates I am working with were generated by a Linux system and thus did not have carriage return characters (\r), only line feeds (\n). To allow this module to work with these certificates, I replaced the StartsWith/EndsWith string checks with Regex -match comparisons and used a pattern which allows for an optional carriage return character.

[darrenjrobinson]

Thanks for the PR.
That approach is much better than what I had.
I'm travelling so will do a review early next week, update the version, sign and re-publish.