Don't enforce v2.13.2 of redux-devtools-extension

After release of v2.13.5 there's no longer following error:
ERROR in [at-loader] ./node_modules/redux-devtools-extension/index.d.ts:159:60
    TS2314: Generic type 'StoreEnhancer' requires 1 type argument(s).

ERROR in [at-loader] ./node_modules/redux-devtools-extension/index.d.ts:161:61
    TS2314: Generic type 'StoreEnhancer' requires 1 type argument(s).

So we don't need to stay at v2.13.2 anymore

package.json

@@ -42,7 +42,7 @@
     "react-redux": "^5.0.7",
     "react-select": "~1.2.1",
     "redux": "~3.7.2",
-    "redux-devtools-extension": "2.13.2",
+    "redux-devtools-extension": "~2.13.5",
     "rxjs": "~5.6.0-forward-compat.2",
     "text-encoder-lite": "git://github.com/coolaj86/TextEncoderLite.git#e1e031b",
     "ui-select": "0.19.8"