Upgrade eslint

Author: nhoizey

.eslintrc.js

@@ -1,11 +1,11 @@
 module.exports = {
-  "env": {
-    "es6": true,
-    "node": true
+  env: {
+    es6: true,
+    node: true,
   },
-  "extends": "plugin:prettier/recommended",
-  "parserOptions": {
-    "ecmaVersion": 2017,
-    "sourceType": "module"
-  }
-};
+  extends: 'plugin:prettier/recommended',
+  parserOptions: {
+    ecmaVersion: 2017,
+    sourceType: 'module',
+  },
+}