Added NLogProviderOptions.ShutdownOnDispose

[304NotModified]

Fixes #313

[codecov-io]

Codecov Report

Merging #314 into dev will decrease coverage by 0.24%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##              dev     #314      +/-   ##
==========================================
- Coverage   81.69%   81.44%   -0.25%     
==========================================
  Files          12       12              
  Lines        1087     1094       +7     
  Branches      190      191       +1     
==========================================
+ Hits          888      891       +3     
- Misses        138      141       +3     
- Partials       61       62       +1

Impacted Files	Coverage Δ
....Extensions.Logging/Logging/NLogProviderOptions.cs	100% <100%> (ø)	⬆️
...g.Extensions.Logging/Logging/NLogLoggerProvider.cs	90.14% <42.85%> (-5.25%)	⬇️

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[snakefoot]

Looks good