Log Message:
Update to 1.19:

1.19   2015-05-31

- If you compared a DateTime object to an undef value, you might have received
  a warning pointing to code inside DateTime.pm, instead of in your own
  code. Fixed by Jason McIntosh. GH #7.

- The 30future-tz.t could fail if run at certain very specific times. This
  should now be much less likely, unless a time zone being tested implements a
  DST change at noon (which would even more insane than DST already is by a
  huge factor). Reported by Karen Etheridge and diagnosed by Slaven Rezic. RT
  #102925.