Bump node-fetch from 2.6.1 to 2.6.7 (#476)

Bumps [node-fetch](https://github.com/node-fetch/node-fetch) from 2.6.1 to 2.6.7.
- [Release notes](https://github.com/node-fetch/node-fetch/releases)
- [Commits](https://github.com/node-fetch/node-fetch/compare/v2.6.1...v2.6.7)

---
updated-dependencies:
- dependency-name: node-fetch
  dependency-type: direct:development
...

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package.json

@@ -121,7 +121,7 @@
         "jest": "^26.6.3",
         "marked": "^4.0.10",
         "merge-stream": "^2.0.0",
-        "node-fetch": "^2.6.1",
+        "node-fetch": "^2.6.7",
         "npmfiles": "^0.1.3",
         "prettier": "^2.2.1",
         "pretty-quick": "^3.1.0"