Add Travis badge.
diff --git a/README.md b/README.md
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 Project is licensed under [Apache License 2.0](http://www.apache.org/licenses/LICENSE-2.0).
 
+
+[![Build Status](https://travis-ci.org/FasterXML/jackson-annotations.png?branch=master)](https://travis-ci.org/FasterXML/jackson-annotations)
+
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 ## Usage, general