Replace Reachability dependency with NWPathMonitor usage

[GianniCarlo]

Hi, I've been looking into integrating this library into my project, with the purpose of using it across iOS and watchOS. Xcode won't build the watchOS target due to the Reachability dependency, which uses SystemConfiguration as stated in #379 (no matter if I use anything related to reachability or not, just including it in my watchOS target fails to compile)

Would you be interested in a PR replacing the use of Reachability for NWPathMonitor from the Network framework which is available on all platforms (although the targets are higher: iOS 12+, macOS 10.14+, watchOS 5.0+, etc)?

I saw one article from Hacking with Swift and the usage looks pretty straight forward, and it also makes available the isExpensive flag for connections

[lucas34]

Sure I have been looking at dropping reachability.
Feel free to send a Pull Request

[lucas34]

@GianniCarlo I have merged it. Thanks for your contribution.
I'll make additional testing and will release a new version. Probably 6.0

[GianniCarlo]

Awesome! let me know if I can be of any help 👍

[lucas34]

@GianniCarlo 6.0.0 is released. Let me know if everything works fine.
Appreciate your contribution.