Log Message:
Update to 1.22

Upstream changes:
1.22     2018-06-08

- Update the glibc source data to the data from glibc 2.27.

- Added documentation for this glibc data.

- Reformatted the DateTime::Locale::FromData docs.

1.21     2018-06-08

- Added a new DateTime::Local->register_from_data method. This replaces the
  old custom locale registration system with something much simpler. Instead
  of providing a new class you simply provide a hash of data for the locale
  and it becomes available for use via DateTime::Local->load. Implemented by
  Ryley Breiddal. PR #21. Addresse GH #19.