VPN check introduced to improve our inner logic.

I have found a way to check the VPN status. So I introduced it here to improve our inner logic in the VPN case.

Bugfixed version

Fix bug in status change notification, thanks to iMickChen!
Same as 1.2.1, but I forgot to modify the readme, so we come to 1.2.2...

Bugfixed version

fix bug in status change notification, thanks to iMickChen!

Double check feature introduced!

Just try this. Thank you.

Xcode 9 Support

Xcode 9 & iOS 11 now supported; and fix some doc errors.

Test version for carthage

1.1.8.1

carthage target changed to 8.0

version 1.1.8

1. carthage support
2. some issues fixed & some improvements done
3. pull request merged

Test Carthage

Test Carthage

version 1.1.7

same as 1.1.6, modify the podspec file to order the files

version 1.1.6 for pod (with subspecs)

1. optimization around ping; the behavior under some special scenes has been improved
2. add two pod subspecs: connection & ping