Add .NET 5.0 as a test target

[atifaziz]

No description provided.

[codecov]

Codecov Report

Merging #777 (8c3d0d5) into master (01edeef) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #777   +/-   ##
=======================================
  Coverage   87.90%   87.90%           
=======================================
  Files         108      108           
  Lines        3473     3473           
  Branches      984      984           
=======================================
  Hits         3053     3053           
  Misses        272      272           
  Partials      148      148           

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