Changes for Locale-XGettext.

0.4  2018-10-21
  - fixes https://github.com/gflohr/Locale-XGettext/issues/3
    That was a blocker for [Qgoda](http://www.qgoda.net/).

0.3  2017-12-31
  - Allow overriding program name.
  - Allow setting CLI options for internal use.

0.2 2017-09-14
  - Allow arbitrary keywords.
  - Check for sufficient version of Getopt::Long.

0.1 2017-09-10
  - Initial version.
