add waffle.io badge

waffle-iron · waffle-iron · commit ce44afae76f1 · 2016-04-15T00:20:21.000-06:00
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+[![Stories in Ready](https://badge.waffle.io/mybatis/mybatis-3.png?label=ready&title=Ready)](https://waffle.io/mybatis/mybatis-3)
 MyBatis SQL Mapper Framework for Java
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