Add deprecation notice to README

# DalekJS is not maintained any longer 😢 We recommend [TestCafé](http://devexpress.github.io/testcafe/) for your automated browser testing needs.
dalekjs · Jun 4, 2017 · 8adde18 · 8adde18
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diff --git a/README.md b/README.md
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+[![No Maintenance Intended](http://unmaintained.tech/badge.svg)](http://unmaintained.tech/)
+
+# DalekJS is not maintained any longer :cry:
+
+We recommend [TestCafé](http://devexpress.github.io/testcafe/) for your automated browser testing needs.
+
+---
+
 dalek-build tools
 -----------------
 
-> Grunt tasks & configs shared across all dalek projects
+> Grunt tasks & configs shared across all dalek projects