Because we might use dependencies soon that require this framework.
And anyway these days the .NET world is mostly a hybrid between
.NETStandard/.NETCore libs and .NET4.6 ones, not older than that.
(This commit was brought from TLSharp [1] version 0.1.0.522.)
[1] 709e5be7cc
WARNING: NU5118: File 'D:\a\TLSharp\TLSharp\TLSharp.Core\bin\Debug\TLSharp.Core.dll' is not added because the package already contains file 'lib\net45\TLSharp.Core.dll'
(This commit was brought from TLSharp [1] version 0.1.0.521.)
[1] 6b35857923