Update fetch-mock to the latest version 🚀 (#53)

* chore(package): update fetch-mock to version 8.0.0

* chore(package): update lockfile package-lock.json

Author: greenkeeper[bot]

package-lock.json

@@ -32,7 +32,7 @@
     "eslint-plugin-node": "^10.0.0",
     "eslint-plugin-promise": "^4.0.0",
     "eslint-plugin-standard": "^4.0.0",
-    "fetch-mock": "^7.3.3",
+    "fetch-mock": "^8.0.0",
     "jest": "^24.1.0",
     "jest-extended": "^0.11.1",
     "jest-haste-map": "^24.5.0",