Update ESLint to 7.16.0 version

- update ESLint to 7.16.0
- fix config file in test directory

Author: kam4atka

package.json

@@ -45,9 +45,9 @@
   },
   "homepage": "https://github.com/htmlacademy/eslint-config-htmlacademy#readme",
   "peerDependencies": {
-    "eslint": ">=4.2.0"
+    "eslint": ">=7.16.0"
   },
   "devDependencies": {
-    "eslint": "4.2.0"
+    "eslint": "7.16.0"
   }
 }

test/es5/.eslintrc.js

@@ -1,8 +1,11 @@
-let config = require('../../es5');
+'use strict';
+
+var config = require('../../es5');
+
 config.env = {
   'es6': false,
   'browser': true,
   'commonjs': true
 };
 
-module.exports = config;
+module.exports = config;

test/es6/.eslintrc.js

@@ -1,21 +1,21 @@
-const config = require('../../es6');
-const es5config = require('../../es5');
+const config = require(`../../es6`);
+const es5config = require(`../../es5`);
 
 const es5Rules = es5config.rules;
 
 config.rules = {
-  ...config.rules,
-  ...es5Rules
+  ...es5Rules,
+  ...config.rules
 };
 
 config.parserOptions = {
-  ecmaVersion: 6,
-  sourceType: 'module'
+  ecmaVersion: 9,
+  sourceType: `module`
 };
 config.env = {
   'es6': true,
   'browser': true,
   'commonjs': true
 };
 
-module.exports = config;
+module.exports = config;

test/node/.eslintrc.js

@@ -1,7 +1,7 @@
-const config = require('../../node');
+const config = require(`../../node`);
 config.parserOptions = {
   ecmaVersion: 6,
-  sourceType: 'module'
+  sourceType: `module`
 };
 config.env = {
   'es6': true,
@@ -10,4 +10,4 @@ config.env = {
   'commonjs': true
 };
 
-module.exports = config;
+module.exports = config;