Cannot compile the clone project with .Net Framework <= 4.0

[tonginbox]

https://github.com/pvginkel/NHttp/blob/41e1bf30313905e329594757426755d0e9d7581c/NHttp/HttpTimeoutManager.cs#L21

The code using 'nameof(...)' which is C# 6.0/Framework 4.x but the NHttp project target framework 2.0 therefore the project fail to compile.

Is this a mistake?

I target it to run on .Net 4.0 therefore I have to remove all of them and it works.