0.1.5   2018-11-27
	Compatiblity with PostgreSQL 11

0.1.4	2017-11-16
	Parallelism for 9.6 and higher
	Adding text(md5hash) and bytea(md5hash) functions for consistency

0.1.3 2017-11-14
      First release after handover
      Immutability fixes
      Join operation estimate fixes

Since 0.1.1 (date unknown)
      Join operations now provide correct estimates
      Functions correctly marked immutable when immutable