fix: pin eslint-plugin-n to ^15.7 to support node 14 (#80)

* fix: install cjs node-fetch as dev dep

package.json

@@ -26,7 +26,7 @@
     "eslint-plugin-import": "^2.28.0",
     "eslint-plugin-jest": "^27.2.3",
     "eslint-plugin-jsdoc": "^42.0.0",
-    "eslint-plugin-n": "^16.0.1",
+    "eslint-plugin-n": "^15.7",
     "eslint-plugin-node": "^11.1.0",
     "eslint-plugin-promise": "^6.1.1",
     "eslint-plugin-standard": "^5.0.0",
@@ -36,6 +36,7 @@
     "jest-junit": "^16.0.0",
     "jest-plugin-fs": "^2.9.0",
     "jsdoc-to-markdown": "^8.0.0",
+    "node-fetch": "^2.6.0",
     "openapi-schema-validator": "^12.1.0",
     "typescript": "^5.1.6"
   },