Delete unsupported ruby versions from CI. (#76)
Delete unsupported ruby versions from CI. (#76)

Travis CI tests ruby 2.0 and 2.1, which forces to use hash rocket. I
think sorcery needs the code guideline by introducing Rubocop in the
future, but this old way notation prevents it.

It's also natural to make users doubt whether this product is still
maintenanced by supporting too old ruby versions. Of course I know
sorcery is actively maintenanced, and it's not good.
Sorcery/sorcery,athix/sorcery,Sorcery/sorcery,Sorcery/sorcery,athix/sorcery,athix/sorcery