Fix linting issue

Author: armano2

lib/rules/no-dupe-keys.js

@@ -6,7 +6,6 @@
 
 const utils = require('../utils')
 const assert = require('assert')
-const getPropertyName = require('eslint/lib/ast-utils').getStaticPropertyName
 
 const RESERVER_NAMES = new Set(require('../utils/vue-reserved.json'))
 const SCOPE_NAMES = new Set(['props', 'computed', 'data', 'methods'])