chore(deps): update dependency redux to v4.2.1

Author: renovate[bot]

package.json

@@ -81,7 +81,7 @@
     "react-redux": "7.2.7",
     "react-router": "^3.2.5",
     "redial": "0.5.0",
-    "redux": "4.1.2",
+    "redux": "4.2.1",
     "remark-cli": "10.0.1",
     "remark-preset-lint-travi": "2.0.9",
     "remark-toc": "8.0.1",