Code versioning

As of writing, Semantic Versioning is used for projects like CertHelper.

In summary:

• Versions take the form: MAJOR.MINOR.PATCH.
• Small changes which fix functionality which is already in place increment the PATCH part.
• Changes which add new features which did not exist before increment the MINOR part. Incrementing it should reset PATCH to 0, e.g. 1.0.4 --> 1.1.0.
• Making changes to stuff that break backwards compatibility increments the MAJOR part, e.g. from 1.0.3 to 2.0.0. Incrementing the MAJOR version resets both MINOR and PATCH.