Readme: Add link to Swift 2.0 version.

Could not find a way to create a relative link to a different branch.
kareman · Jun 30, 2015 · f6cda84 · f6cda84
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+_This is the **Swift 1.2** version (Xcode 6.3). Go [here](https://github.com/kareman/FootlessParser/tree/Swift2.0) for Swift 2.0 (Xcode 7)._
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 # FootlessParser
 
 FootlessParser is a simple and pretty naive implementation of a parser combinator in Swift. It enables infinite lookahead, non-ambiguous parsing with error reporting.