Revert "refactor: use flat config for eslint (#201)"

This reverts commit 1030daf.

Author: aladdin-add

.eslintignore

@@ -0,0 +1 @@
+!.eslintrc.js

.eslintrc.js

@@ -0,0 +1,32 @@
+"use strict";
+
+module.exports = {
+    rules: {
+        "node/no-unpublished-require": "off",
+        camelcase: [
+            "error",
+            {
+                properties: "never"
+            }
+        ],
+        "node/no-extraneous-require": [
+            "error",
+            {
+                allowModules: [
+                    "@octokit/rest"
+                ]
+            }
+        ]
+    },
+    parserOptions: {
+        ecmaVersion: 8
+    },
+    extends: [
+        "eslint"
+    ],
+    env: {
+        node: true,
+        es6: true
+    },
+    root: true
+};