Update to latest defs

Merge pull request #203 from ppeble/ppeble/bump-540

Bump to 5.4.0 with latest defs

Fix jp holidays.

Fix jp holidays.

Update definitions.

Please see the CHANGELOG for more details.

Update many definitions.

Please see the CHANGELOG for more details.

Update many definitions.

Please see the CHANGELOG for more details.

Commenting out a failing `it` test due to limitations of the current definition format.

Please see the CHANGELOG for more details.

Update `year_ranges` and many definitions

Major semver bump due to changes related to the year_ranges option as well as additional unrelated region updates for the following regions:

• it (and related subregions)
• th
• es
• gb
• hu
• us_il and us_ca
• ro
• lv

Please see the CHANGELOG for more details.

Update `jp`, `federalreserve`, `de_be` and add `th`

See the CHANGELOG for more details.

Update handling of non-standard regions and other various updates

Changes non-standard regions to avoid underscores and includes various other region updates. Please see the CHANGELOG for more details.

Update `ch` New Year's holiday

Please see the CHANGELOG for more details.