Update README.md

README.md

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 # cjdns
 
+[![Build Status](https://travis-ci.org/cjdelisle/cjdns.png?branch=master)](https://travis-ci.org/cjdelisle/cjdns)
+
 Encrypted networking for regular people.
 
 Cjdns implements an encrypted IPv6 network using public key cryptography for