upgrade node-fetch to 2.2.0

package.json

@@ -73,7 +73,7 @@
     "mkdirp": "^0.5.1",
     "moment": "^2.21.0",
     "mustache": "^2.3.0",
-    "node-fetch": "https://github.com/scottnonnenberg-signal/node-fetch.git#3e5f51e08c647ee5f20c43b15cf2d352d61c36b4",
+    "node-fetch": "^2.2.0",
     "node-gyp": "^3.8.0",
     "node-sass": "^4.9.3",
     "os-locale": "^2.1.0",

yarn.lock

@@ -5680,13 +5680,17 @@ node-dir@^0.1.10:
   dependencies:
     minimatch "^3.0.2"
 
-node-fetch@^1.0.1, "node-fetch@https://github.com/scottnonnenberg-signal/node-fetch.git#3e5f51e08c647ee5f20c43b15cf2d352d61c36b4":
+node-fetch@^1.0.1:
   version "1.7.3"
   resolved "https://github.com/scottnonnenberg-signal/node-fetch.git#3e5f51e08c647ee5f20c43b15cf2d352d61c36b4"
   dependencies:
     encoding "^0.1.11"
     is-stream "^1.0.1"
 
+node-fetch@^2.2.0:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/node-fetch/-/node-fetch-2.2.0.tgz#4ee79bde909262f9775f731e3656d0db55ced5b5"
+
 node-forge@0.7.1:
   version "0.7.1"
   resolved "https://registry.yarnpkg.com/node-forge/-/node-forge-0.7.1.tgz#9da611ea08982f4b94206b3beb4cc9665f20c300"