GoToCN support system version of the platform

Due to the different support levels of system-level acceleration services for each operating platform, some older versions cannot provide stable network services. Therefore, only the following versions are supported at present, which is inconvenient for you.

- iOS needs iOS 9.0 or higher on iOS

- Android requires Android 4.1 or above

- PC side requires Win XP or later

- Mac side needs Mac os 10.11 or higher