Change check to be a little less strict

[jessedearing]

Versions can be compared in Ruby, so this will help check them easier.

[maxgarvey]

Someone! Please merge this. I know there's not much activity on this repo, but not supporting Java 1.8 is not cool! plus the error message that comes up is misleading (indicating that >= 1.6 will work)

[CLAassistant]

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