docs(cookbook/graphql): Add @types/isomorphic-fetch

Author: Urigo

public/docs/_examples/package.json

@@ -45,6 +45,7 @@
     "@types/angular-sanitize": "^1.3.3",
     "@types/chai": "^3.4.34",
     "@types/graphql": "^0.8.6",
+    "@types/isomorphic-fetch": "0.0.32",
     "@types/jasmine": "~2.5.36",
     "@types/lodash": "^4.14.43",
     "@types/node": "^6.0.45",