bruxy70/Holidays 1.7.4

General code improvements, fixes (unit testing is working again)

on GitHub

General code improvements, that should improve performance (not that it was an issue).
Also, unit testing is working again - it did not work with the newest release for a couple of days - otherwise it would have prevented the need for the last release.
Also will be traveling later this week, so I am releasing that over the weekend, so I have the time to catch and fix possible issues (should not happen).