Merge pull request #2223 from dart-lang/mit-mit-patch-1

Add travis badge
diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
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+[![Build Status](https://travis-ci.org/dart-lang/pub.svg?branch=master)](https://travis-ci.org/dart-lang/pub)
+
 Pub is the package manager for Dart.
 
 # Contributing to pub