Upgrade cross-fetch 2.2.3 -> 3.0.0

Author: ehmicky

package-lock.json

@@ -62,7 +62,7 @@
     "@babel/plugin-transform-runtime": "^7.2.0",
     "@babel/preset-env": "^7.2.0",
     "ava": "^1.0.0-rc.2",
-    "cross-fetch": "^2.2.3",
+    "cross-fetch": "^3.0.0",
     "eslint": "^5.10.0",
     "eslint-config-prettier": "^3.3.0",
     "eslint-config-standard": "^12.0.0",