Add the node-fetch dependency

Author: lordofthelake

package.json

@@ -50,6 +50,7 @@
     "invariant": "^2.2.2",
     "js-sha1": "^0.6.0",
     "murmur2js": "^1.0.0",
+    "node-fetch": "^2.6.0",
     "node-sketch-bridge": "^0.2.0",
     "normalize-css-color": "^1.0.1",
     "pegjs": "^0.10.0",