Update dependency cross-fetch to v3.1.5 [SECURITY]

Author: renovate[bot]

package.json

@@ -36,7 +36,7 @@
     "apollo-utilities": "1.2.1",
     "chalk": "2.4.2",
     "cross-env": "5.2.0",
-    "cross-fetch": "3.0.1",
+    "cross-fetch": "3.1.5",
     "dotenv": "7.0.0",
     "emotion": "10.0.9",
     "graphql": "14.1.1",