Ruby 3 support

* add the blocking_activity_logger_verbose option

Bugfix:

* Execute NOT NULL with ADD COLUMN in PG11+ (doctolib#39)

Documentation:
Updated readme

Minor changes:

* not adding index concurrently if table creation

v1.1.0

* Made add_column indempotent
* Safe foreign key
* Add statement_timeout on change_column

Version 1.0.0 Contains breaking changes

Version 0.0.3

Version 0.0.2

Version 0.0.1