Update dependency isomorphic-fetch to v3

Author: renovate-bot

package.json

@@ -65,7 +65,7 @@
     "enzyme-adapter-react-16": "^1.11.2",
     "eslint": "^6.1.0",
     "husky": "^4.2.1",
-    "isomorphic-fetch": "^2.2.1",
+    "isomorphic-fetch": "^3.0.0",
     "jest": "^25.1.0",
     "react": "^16.4.0",
     "react-dom": "^16.4.0",