Add badges.

Author: jcs090218

README.md

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+[![Build Status](https://travis-ci.com/jcs-elpa/jayces-mode.svg?branch=master)](https://travis-ci.com/jcs-elpa/jayces-mode)
+[![License: GPL v3](https://img.shields.io/badge/License-GPL%20v3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0)
+
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 # jayces-mode
 > Major mode for editing JayCeS file.