Reduce version of Ruby Gems

v1.0.5

Drop required Ruby Gems version

Modernization

v1.0.4

Merge branch 'modernization'

Version 1.0.0

This version was introduced to support Rails 5. It depends on activerecord ~> 5.0 and contains several large gem upgrades.
This is not a backwards compatible upgrade, and introduces many breaking changes if there is no gem compatibility.