Update dependencies to enable Greenkeeper 🌴 (#3940)

* chore(package): update dependencies

* docs(readme): add Greenkeeper badge

* Fix indent issues with eslint 4.0

see http://eslint.org/docs/user-guide/migrating-to-4.0.0\#-the-indent-rule-is-more-strict

.eslintrc.json

@@ -21,6 +21,7 @@
         "space-in-parens": ["error", "never"],
         "no-multiple-empty-lines": 1,
         "prefer-const": "error",
-        "space-infix-ops": "error"
+        "space-infix-ops": "error",
+        "no-useless-escape": "off"
     }
 }