add gem badge

2014-06-25 15:24:03 -04:00
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 Yet Another Way to Parse Arguments is an argument-parsing library for Ruby.

+[![Gem Version](https://badge.fury.io/rb/yawpa.png)](http://badge.fury.io/rb/yawpa)
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 ## Features

 - POSIX or non-POSIX mode (supports subcommands using POSIX mode)