Add travis build badges

[skip ci]

Author: acoulton

README.md

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+# Kohana - ORM module
+
+| ver   | Stable                                                                                                                     | Develop                                                                                                                      |
+|-------|----------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------|
+| 3.3.x | [![Build Status - 3.3/master](https://travis-ci.org/kohana/orm.svg?branch=3.3%2Fmaster)](https://travis-ci.org/kohana/orm) | [![Build Status - 3.3/develop](https://travis-ci.org/kohana/orm.svg?branch=3.3%2Fdevelop)](https://travis-ci.org/kohana/orm) |
+| 3.4.x | [![Build Status - 3.4/master](https://travis-ci.org/kohana/orm.svg?branch=3.4%2Fmaster)](https://travis-ci.org/kohana/orm) | [![Build Status - 3.4/develop](https://travis-ci.org/kohana/orm.svg?branch=3.4%2Fdevelop)](https://travis-ci.org/kohana/orm) |