Add additional TFM ie net standard 2.0

[thompson-tomo]

Is your feature request related to a problem? Please describe.
I want to minimise dependencies in my project by utilising framework dependencies wherever possible

Describe the solution you'd like
I want the package to have an additional TFM added so that the explicit dependency on NetStandard.Library can be removed.

Describe alternatives you've considered
Accept the additional dependency

Additional context
n/a