Fix: support eslint v6 (#172)

* Fix: support eslint v6

refs: #95 (comment)

* chore: simplify eslint config

Author: aladdin-add

.eslintrc.js

@@ -5,13 +5,9 @@ module.exports = {
   plugins: ['node'],
   extends: [
     'not-an-aardvark/node',
-    'plugin:node/recommended',
     'plugin:unicorn/recommended',
+    'plugin:node/recommended',
   ],
-  parserOptions: {
-    ecmaVersion: 2021,
-    sourceType: 'script',
-  },
   rules: {
     'comma-dangle': [
       'error',

package.json

@@ -58,7 +58,7 @@
     "nyc": "^15.1.0"
   },
   "peerDependencies": {
-    "eslint": "^7.0.0"
+    "eslint": ">=6.0.0"
   },
   "engines": {
     "node": "^10.12.0 || >=12.0.0"