Update README.md

Author: manolo

README.md

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 ## NOTICE: This library is no longer supported by Vaadin
 
 Vaadin transfers the ownership of this library, thus Vaadin no longer provides support or does active development on it. 
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 We took this decision because once demonstrated that polymer elements could be easily be integrated in GWT, we want to invest our team’s time in adding valuable user benefits to Vaadin Core Elements, and pass the baton to the community to do integrations with other frameworks.
 
 **In addition, we are happy to announce that ownership of the repository will be transferred by 20 Apr 2017 to [@manolo](https://github.com/manolo), who will continue to maintain it.**