Have CI test the latest rubies from the 2.0, 2.1, and 2.2 version lines
Have CI test the latest rubies from the 2.0, 2.1, and 2.2 version lines

rubyroidlabs/carrierwave-aws,bogdan-dumitru/carrierwave-aws,leapingfrogs/carrierwave-aws,sorentwo/carrierwave-aws,pranas/carrierwave-aws