Add latest rubies to travis.
Add latest rubies to travis.

assaf/vanity,Futurelearn/vanity,mockra/vanity,Futurelearn/vanity,CGTrader/vanity,peterkovacs/vanity,Futurelearn/vanity,HealthyDelivery/vanity,glioinc/vanity,HealthyDelivery/vanity,CGTrader/vanity,Mario245/vanity,glioinc/vanity,peterkovacs/vanity,CGTrader/vanity,assaf/vanity,Mario245/vanity,assaf/vanity,peterkovacs/vanity,mockra/vanity,mockra/vanity,HealthyDelivery/vanity,Mario245/vanity,glioinc/vanity