update dependencies

.eslintrc.yml

@@ -4,7 +4,7 @@ extends: 'eslint:recommended'
 parserOptions:
   ecmaVersion: 5
 rules:
-  indent: [ 2, 2, { SwitchCase: 1 } ]
+  indent-legacy: [ 2, 2, { SwitchCase: 1 } ]
   no-trailing-spaces: 2
   quotes: 0
   linebreak-style: [ 2, unix ]

package.json

@@ -4,7 +4,7 @@
   "description": "$merge and $patch keywords for Ajv JSON-Schema validator to extend schemas",
   "main": "index.js",
   "scripts": {
-    "eslint": "if-node-version '>=4' eslint index.js keywords spec",
+    "eslint": "eslint index.js keywords spec",
     "test": "npm run eslint && npm run test-cov",
     "test-spec": "mocha spec/*.spec.js -R spec",
     "test-cov": "istanbul cover -x '**/spec/**' node_modules/mocha/bin/_mocha -- spec/*.spec.js -R spec"
@@ -38,11 +38,10 @@
   },
   "devDependencies": {
     "ajv": "^8.2.0",
-    "coveralls": "^2.11.12",
-    "eslint": "^3.3.0",
-    "if-node-version": "^1.0.0",
+    "coveralls": "^3.1.1",
+    "eslint": "^7.8.1",
     "istanbul": "^0.4.4",
-    "mocha": "^3.0.2",
+    "mocha": "^9.0.3",
     "pre-commit": "^1.1.3"
   },
   "peerDependencies": {