WebRequest is deprecated

[kiddailey]

WebRequest is used for all requests but that particular method has been deprecated and Microsoft recommends migrating to HttpClient instead. As HttpClient is async, this also relates to issue #14.

[ComputerGhost]

WebRequest is used to allow cache sharing with other applications such as IE. I agree that it needs replaced, but I'm putting this off for a major version upgrade since it removes an advertised feature.

[kiddailey]

Ah, I see. I'm probably going to have to maintain my own version then as using WebRequest doesn't appear to be 100% cross-platform anymore. Specifically, I'm seeing some WebRequests on iOS and Android fail for unknown reasons. I have a working async version using HttpClient implemented and in testing that resolves those issues on all platforms.