chore(deps): update eslint and prettier

Author: renovate-bot

package-lock.json

@@ -27,9 +27,9 @@
     "@cybozu/eslint-config": "^5.2.0",
     "@types/node": "^12.6.9",
     "eslint": "^6.0.1",
-    "eslint-config-eslint": "^5.0.1",
+    "eslint-config-eslint": "^6.0.0",
     "eslint-plugin-eslint-plugin": "^2.1.0",
-    "eslint-plugin-node": "^9.1.0",
+    "eslint-plugin-node": "^11.0.0",
     "mocha": "^6.2.2",
     "nyc": "^14.1.1",
     "prettier": "^1.18.2",