Unity 6000 or over does not work due to version patterning.

[wanomaniac]

Bug description
Activate fails because of version patterning.
How to reproduce
Put an unity 6000 version as a unityVersion in the input.

• Expected behavior
  Not give an invalid version error.

Additional details
Root of the problem.

// From Src/Model/ImageTag.ts
 static get versionPattern() {
    return /^20\d{2}\.\d\.\w{3,4}|3$/;
  } // The problem. It looks for 20 because of Unity's previous 21st century version name scheme. They abandoned it and its causing problems