Update dependency jwt-decode to v4

Author: renovate[bot]

package-lock.json

@@ -13,7 +13,7 @@
     "apollo-link-ws": "^1.0.8",
     "graphql": "^0.13.2",
     "graphql-tag": "^2.9.2",
-    "jwt-decode": "^2.2.0",
+    "jwt-decode": "^4.0.0",
     "react": "^16.4.2",
     "react-apollo": "^2.1.9",
     "react-dom": "^16.4.2",