Object.entries is not compatible with < iOS 10.3 after 6.4.14

[doxiaodong]

• Swiper Version: e0d1909.
• Platform/Target and Browser Versions: < iOS 10.2

What You Did

Nothing

Expected Behavior

Compatible with iOS 9+

Maybe add acorn for es5 checking is a stable way

try {
  require('acorn').parse(source, {
    ecmaVersion: 5
  });
} catch (error) {process.exit(1)}