Remove redundant target frameworks

[Tyrrrz]

The removed targets should already be covered by existing netstandard targets.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.00%. Comparing base (edc95c6) to head (2a41195).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #267   +/-   ##
=======================================
  Coverage   95.00%   95.00%           
=======================================
  Files          46       46           
  Lines        1100     1100           
  Branches       85       85           
=======================================
  Hits         1045     1045           
  Misses         35       35           
  Partials       20       20           

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[hawkeye116477]

Is support for 4.6.2 dropped?

From MS site:

CONSIDER adding a target for net462 when you're offering a netstandard2.0 target.

Using .NET Standard 2.0 from .NET Framework has some issues that were addressed in .NET Framework 4.7.2. You can improve the experience for developers that are still on .NET Framework 4.6.2 - 4.7.1 by offering them a binary that's built for .NET Framework 4.6.2.

[Tyrrrz]

@hawkeye116477 have you tried using it?