Do not build for Ruby 2.0
Do not build for Ruby 2.0

Ruby 2.0 is deprecated and we should not build against it on travis
any more to reduce build time and save some resources.

mtomov/alchemy_cms,mtomov/alchemy_cms,AlchemyCMS/alchemy_cms,mamhoff/alchemy_cms,chalmagean/alchemy_cms,mtomov/alchemy_cms,robinboening/alchemy_cms,robinboening/alchemy_cms,AlchemyCMS/alchemy_cms,mixandgo/alchemy_cms,mixandgo/alchemy_cms,mixandgo/alchemy_cms,nielspetersen/alchemy_cms,IngoAlbers/alchemy_cms,akra/alchemy_cms,akra/alchemy_cms,nielspetersen/alchemy_cms,mamhoff/alchemy_cms,mtomov/alchemy_cms,akra/alchemy_cms,akra/alchemy_cms,nielspetersen/alchemy_cms,chalmagean/alchemy_cms,mamhoff/alchemy_cms,mixandgo/alchemy_cms,IngoAlbers/alchemy_cms,IngoAlbers/alchemy_cms,IngoAlbers/alchemy_cms,chalmagean/alchemy_cms,AlchemyCMS/alchemy_cms,nielspetersen/alchemy_cms,robinboening/alchemy_cms,chalmagean/alchemy_cms