Bump node-fetch from 2.5.0 to 2.6.0 (#5712)

Bumps [node-fetch](https://github.com/bitinn/node-fetch) from 2.5.0 to 2.6.0.
- [Release notes](https://github.com/bitinn/node-fetch/releases)
- [Changelog](https://github.com/bitinn/node-fetch/blob/master/CHANGELOG.md)
- [Commits](https://github.com/bitinn/node-fetch/compare/v2.5.0...v2.6.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -83,7 +83,7 @@
     "jsdoc-babel": "0.5.0",
     "lint-staged": "8.2.1",
     "mongodb-runner": "4.3.2",
-    "node-fetch": "2.5.0",
+    "node-fetch": "2.6.0",
     "nyc": "14.1.1",
     "prettier": "1.18.2",
     "supports-color": "7.0.0"