add compatibility with react-redux v7

possible because of the return of store as a Prop to react-redux (missing in v6)

package.json

@@ -99,7 +99,7 @@
   "peerDependencies": {
     "react": "^15.3.0 || ^16.0.0",
     "react-dom": "^0.14.7 || ^15.0.0 || ^16.0.0",
-    "react-redux": "^4.0.0 || ^5.0.3",
+    "react-redux": "^4.0.0 || ^5.0.3 || ^7.0.0",
     "redux": "^3.0.0 || ^4.0.0"
   }
 }