Fixed MissingMethodException for HostBuilderContext.get_HostingEnvironment()

[snakefoot]

Resolves #598

[codecov-commenter]

Codecov Report

Merging #599 (e171bbe) into master (ee17a8e) will increase coverage by 0.13%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #599      +/-   ##
==========================================
+ Coverage   79.94%   80.08%   +0.13%     
==========================================
  Files          18       18              
  Lines        1576     1577       +1     
  Branches      264      264              
==========================================
+ Hits         1260     1263       +3     
  Misses        191      191              
+ Partials      125      123       -2     

Impacted Files	Coverage Δ
...tensions.Hosting/Extensions/ConfigureExtensions.cs	88.67% <100.00%> (+4.06%)	⬆️

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