SixArm/sixarm_ruby_active_record_migration_mock

# Changes

* 2018-06-24 2.1.0 Add column options
* 2018-06-22 2.0.0 Update to Ruby 2.5, testing gems, etc.
* 2015-07-07 1.0.10 Update gemspec to use file manifest
* 2012-03-14 1.0.9  Update docs, tests
* 2011-10-06 1.0.8  Updates for gem publishing