README: Adding a note that 1.9 mode has to be enabled in JRuby. #42

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@@ -9,7 +9,7 @@ girl\_friday is a Ruby library for performing asynchronous tasks. Often times y
Installation
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-We recommend using [JRuby 1.6+](http://jruby.org) or [Rubinius 2.0+](http://rubini.us) with girl\_friday. Both are excellent options for executing Ruby these days.
+We recommend using [JRuby 1.6+](http://jruby.org) or [Rubinius 2.0+](http://rubini.us) with girl\_friday. Both are excellent options for executing Ruby these days. Make sure you set them to 1.9 mode.
gem install girl_friday