Small fix for checking against the Rails version.
Small fix for checking against the Rails version.

Jyaasa/rabl,sideci-sample/sideci-sample-rabl,bholzer/rabl,infertux/rabl,Jyaasa/rabl,sideci-sample/sideci-sample-rabl,nesquena/rabl,infertux/rabl,zoyi/rabl,nesquena/rabl,infertux/rabl,Jyaasa/rabl,zoyi/rabl,zoyi/rabl,bholzer/rabl,bholzer/rabl,nesquena/rabl