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

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Commits on Nov 3, 2011
  1. @xaviershay

    Adding a note that 1.9 mode has to be enabled in JRuby.

    xaviershay committed Nov 3, 2011
    (Otherwise you get a syntax error on `class Batch; def initialize(enumerable=nil, options, &block)` - options needs to default to nil for compat)