Bump node-fetch from 2.1.2 to 2.2.0

Bumps [node-fetch](https://github.com/bitinn/node-fetch) from 2.1.2 to 2.2.0.
- [Release notes](https://github.com/bitinn/node-fetch/releases)
- [Changelog](https://github.com/bitinn/node-fetch/blob/master/CHANGELOG.md)
- [Commits](node-fetch/node-fetch@v2.1.2...v2.2.0)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot-support

package.json

@@ -116,7 +116,7 @@
     "eslint": "~4.19.1",
     "istanbul": "1.1.0-alpha.1",
     "mocha": "~5.2.0",
-    "node-fetch": "^2.1.2",
+    "node-fetch": "^2.2.0",
     "nodemon": "~1.18.3",
     "nyc": "^12.0.2",
     "wait-on": "~2.1.0"

yarn.lock

@@ -4023,9 +4023,9 @@ [email protected]:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/nocache/-/nocache-2.0.0.tgz#202b48021a0c4cbde2df80de15a17443c8b43980"
 
-node-fetch@^2.1.2:
-  version "2.1.2"
-  resolved "https://registry.yarnpkg.com/node-fetch/-/node-fetch-2.1.2.tgz#ab884e8e7e57e38a944753cec706f788d1768bb5"
+node-fetch@^2.2.0:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/node-fetch/-/node-fetch-2.2.0.tgz#4ee79bde909262f9775f731e3656d0db55ced5b5"
 
 node-gyp@^3.3.1:
   version "3.7.0"