chore: Use Ruby 2.3.3 for development
chore: Use Ruby 2.3.3 for development

playon/doorkeeper-openid_connect,playon/doorkeeper-openid_connect,doorkeeper-gem/doorkeeper-openid_connect,doorkeeper-gem/doorkeeper-openid_connect,doorkeeper-gem/doorkeeper-openid_connect,doorkeeper-gem/doorkeeper-openid_connect