add build status

Signed-off-by: Christopher Guindon <chris.guindon@eclipse-foundation.org>

README.md

-# jakarta.ee-website
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+# jakarta.ee-website
+
+[![Build Status](https://travis-ci.org/jakartaee/jakarta.ee-website.svg?branch=master)](https://travis-ci.org/jakartaee/jakarta.ee-website)
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