Merge pull request holidays#354 from ppeble/point-to-v500-definitions

Add latest v5.0.1 definitions and fully update CHANGELOG for v8.0.0 gem release

Merge pull request holidays#341 from ppeble/fix-v710-changelog

Fix v7.1.0 CHANGELOG entry to remove incorrect reference to ruby 2.6

Merge pull request holidays#334 from ppeble/issue-331

[issue 331] Remove underscores from non-standard regions to avoid parent/child region issues

Merge pull request holidays#327 from ppeble/issue-264

[issue-264] fix any_holidays_during_work_week? method to use expected logic

update version number

Merge pull request holidays#297 from ppeble/bump_to_v630

Bump defs to 2.3.0 and gem version to 6.3.0

Merge pull request holidays#292 from ppeble/maintainers

Add MAINTAINERS.md guide

Merge pull request holidays#284 from ppeble/bump_to_v610

Update defs and bump to version 6.1.0

Remove ruby 2.1.0 reference from README. Oops!

Merge pull request holidays#278 from ppeble/bump_to_v560

Bump to v5.6.0