Please release new version on NuGet

[rob-spoor]

The current version on NuGet, 1.4.0, only supports .NET 4.5. This causes warnings when building our test suite.

The project in this repository already supports .NET Standard 2.0. That means that the current master branch can probably be released as-is.

[summatix]

I recommend using dansiegel's fork which is available on NuGet under AP.MockHttpServer: https://github.com/dansiegel/MockHttpServer

[rob-spoor]

Thanks, that got rid of my last build warning.