fix: upgrade redux from 4.1.2 to 4.2.0

Snyk has created this PR to upgrade redux from 4.1.2 to 4.2.0.

See this package in npm:
https://www.npmjs.com/package/redux

See this project in Snyk:
https://app.snyk.io/org/jamesdbloom/project/16eaafd0-fedd-4627-8f06-e3d0bfeaba02?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

package-lock.json

@@ -37,7 +37,7 @@
     "react-redux": "^5.0.6",
     "react-router-dom": "^4.2.2",
     "react-virtual-list": "^2.2.4",
-    "redux": "^4.1.2",
+    "redux": "^4.2.0",
     "redux-form": "^7.4.3",
     "redux-form-material-ui": "^4.3.3",
     "redux-thunk": "^2.4.1"