fix: pin eslint-plugin-n to ^15.7 to support node 14 (#204)

Author: MichaelGoberling

package.json

@@ -27,7 +27,7 @@
     "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",
     "execa": "^4.0.0",