Version 1.0.0, released 2012-12-25
  - initial release

Version 1.0.1, released 2015-01-23
  - fix build on PostgreSQL 9.3+

Version 1.0.2, released 2015-08-02
  - first stable release

Version 1.1.0, released 2016-06-12
  - user-defined system time

Version 1.1.1, released 2017-01-16
  - memory leak fixed

Version 1.2.0, released 2017-11-07
  - PostgreSQL 10 support

Version 1.2.1, released 2023-03-30
  - PostgreSQL 12-15 support