Merge pull request #3 from gitter-badger/gitter-badge

Add a Gitter chat badge to README.md

+# robot_tests
+
+[![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/openprocurement/robot_tests?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
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