Update default dev ruby version to 2.3.0
Update default dev ruby version to 2.3.0

pact-foundation/pact_broker,pact-foundation/pact_broker,tancnle/pact_broker,ThePletch/pact_broker,ThePletch/pact_broker,tancnle/pact_broker,ThePletch/pact_broker,tancnle/pact_broker,pact-foundation/pact_broker,ThePletch/pact_broker,bethesque/pact_broker,bethesque/pact_broker,pact-foundation/pact_broker,bethesque/pact_broker,tancnle/pact_broker,bethesque/pact_broker