Upgrade lodash dependency to ^4.2.0.

Author: Sébastien HOUZÉ

package.json

@@ -61,7 +61,7 @@
     "react": "^0.14.0"
   },
   "dependencies": {
-    "lodash": "^3.10.1",
+    "lodash": "^4.2.0",
     "react-redux": "^4.0.0",
     "redux": "^3.0.0"
   }

src/instrument.js

@@ -1,4 +1,4 @@
-import difference from 'lodash/array/difference';
+import {difference} from 'lodash/array';
 
 export const ActionTypes = {
   PERFORM_ACTION: 'PERFORM_ACTION',

src/persistState.js

@@ -1,5 +1,5 @@
-import mapValues from 'lodash/object/mapValues';
-import identity from 'lodash/utility/identity';
+import {mapValues} from 'lodash/object';
+import {identity} from 'lodash/utility';
 
 export default function persistState(sessionId, deserializeState = identity, deserializeAction = identity) {
   if (!sessionId) {