Log Message:
Update to 1.27

Upstream changes:
1.27     2018-06-09

- This release is identical to 1.26 except that it is a stable release, not a
  trial.

- Fixed the tests so they will not break in the year 2020. The tests were
  passing in 2-digit years on the assumption that a year like "70" would be
  treated as 1970, but starting in 2020 this would be treated as 2070
  instead. Reported by Bernhard M. Wiedemann. RT #124787.

- Added timelocal_modern and timegm_modern variants as optional exports. These
  versions do not munge years at all. They treat the year value that they are
  given exactly as-is.

1.26     2018-05-20 (TRIAL RELEASE)

- Fixed the tests so they will not break in the year 2020. The tests were
  passing in 2-digit years on the assumption that a year like "70" would be
  treated as 1970, but starting in 2020 this would be treated as 2070
  instead. Reported by Bernhard M. Wiedemann. RT #124787.

- Added timelocal_modern and timegm_modern variants as optional exports. These
  versions do not munge years at all. They treat the year value that they are
  given exactly as-is.