Update README.md

Author: bmarkov

README.md

@@ -1,5 +1,6 @@
 [![Published on webcomponents.org](https://img.shields.io/badge/webcomponents.org-published-blue.svg)](https://www.webcomponents.org/collection/HTMLElements/smarthtmlelements-core)
 
+[![Build Status](https://www.travis-ci.com/HTMLElements/Team.svg?token=4VSAagStBB3xmHF2Epxz&branch=master)](https://www.travis-ci.com/HTMLElements/Team)
 
 Best Material Components for the Web
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