v2.0.0

Update README.md

v1.6.1

• Add belongs_to optional true to setup_association (#264, @josephMG)
• Add missing field for Mongoid (#254, @fibrasek)
• Implemented patch that will add the Rails major version to the migration file (#248, @jordanhudgens)
• Add params filtering on new column (#246, @rposborne)
• Add a DB migration to add params to schema. (#245, @rposborne)