Update README.md for travis

Author: tsuckow

Diff for: README.md

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 Scala extensions for Google Guice 7.0.0
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-**Develop:** [![Build Status](https://travis-ci.org/codingwell/scala-guice.png?branch=develop)](https://travis-ci.org/codingwell/scala-guice)
+**Develop:** [![Build Status](https://api.travis-ci.com/codingwell/scala-guice.svg?branch=develop)](https://app.travis-ci.com/github/codingwell/scala-guice)
 
 Getting Started
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