perf: Remove unused es6.number.constructor polyfill (#58)

perf: Remove unused es6.number.constructor polyfill

Author: gilbitron

babel.config.js

@@ -1,5 +1,5 @@
 module.exports = {
     presets: [
-        '@vue/app'
+        ['@vue/app', { useBuiltIns: false }]
     ]
 }