Support Ruby Versions - README

[whithajess]

So in the README it says "March Hare supports JRuby 9000+ in 1.9 mode."

On Jruby.org "For JRuby 9000 we only support a single version of Ruby. For 9.0.0.0 we will
support Ruby 2.2, the current version of Ruby. As new versions of Ruby come out you should expect to see a version of JRuby come out that supports the same features."

Is this just something left over from previous code with 7e294f3? Or is there actually some other compatibility mode I have not been able to find?

[whithajess]

Thanks