Lock react-json-tree at 0.5.5 because of #39

Author: gaearon

package.json

@@ -56,7 +56,7 @@
     "redux-devtools": "^3.0.0"
   },
   "dependencies": {
-    "react-json-tree": "^0.5.1",
+    "react-json-tree": "0.5.5",
     "react-pure-render": "^1.0.2",
     "redux-devtools-themes": "^1.0.0"
   }