Test with Ruby 4.0 on CI

Updated test setup [skip ci]

Version bump to 0.6.3 [skip ci]

Added test for partitioned table and partition [skip ci]

Added support for multiple --statement options

Added tests for --create with partition

Added tests for --create with partitioned table

Moved --create tests to separate file [skip ci]

Added test for partitioned table

Added --non-concurrently option - closes #64

Updated readme [skip ci]

Updated Docker image for pg 1.6.0 [skip ci]

Version bump to 0.6.2 [skip ci]

Updated Hosted Postgres guide [skip ci]

Avoid adding plans with no cost