Use most recent version of ruby minor versions for 2.1.
Use most recent version of ruby minor versions for 2.1.

Travis actually only provides the latest versions preinstalled into the VM for 2.1.x, but >= 2.2.2 is needed for rails 5 and 2.3 is supported as an alias yet: https://twitter.com/roidrage/status/681760928229134336.

peterkovacs/vanity,peterkovacs/vanity,Futurelearn/vanity,Futurelearn/vanity,HealthyDelivery/vanity,assaf/vanity,assaf/vanity,HealthyDelivery/vanity,Futurelearn/vanity,assaf/vanity,HealthyDelivery/vanity,peterkovacs/vanity