Fixed travis build link in README.md

README.md

-[![Build Status](https://travis-ci.org/devttys0/binwalk.png)](https://travis-ci.org/devttys0/binwalk)
+[![Build Status](https://travis-ci.org/ReFirmLabs/binwalk.png)](https://travis-ci.org/ReFirmLabs/binwalk)
 
 Description
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