AURORA-388 - Update changelog to only pickup fixed issues

Updates the changelog jql to only pick up fixed and done issues.

Testing Done:
Removed CHANGELOG file and switched .auroraversion to 0.5.0 and re-ran script, came back with 160 issues vs the 183 currently listed.

Bugs closed: AURORA-388

Reviewed at https://reviews.apache.org/r/21111/