fix(package): update react-transition-group to version 4.2.2

Closes #463

Author: greenkeeper[bot]

package.json

@@ -84,7 +84,7 @@
     "classnames": "^2.2.5",
     "keycode": "^2.1.9",
     "prop-types": "^15.5.10",
-    "react-transition-group": "^2.3.1"
+    "react-transition-group": "^4.2.2"
   },
   "standard": {
     "parser": "babel-eslint",