Fix assembly-version

[304NotModified]

fixes #222 and fixes NLog/NLog#2428

thanks @snakefoot!

[snakefoot]

@304NotModified Maybe make this dependency NetStandard1.3 only (Removing it as dependency for NetStandard1.5 and net451)

<PackageReference Include="Microsoft.Extensions.PlatformAbstractions" Version="1.0.0" />

[304NotModified]

merci!

[codecov]

Codecov Report

Merging #224 into master will decrease coverage by <1%.
The diff coverage is 0%.

@@          Coverage Diff           @@
##           master   #224    +/-   ##
======================================
- Coverage      59%    58%   -<1%     
======================================
  Files          29     29            
  Lines         397    395     -2     
  Branches       92     92            
======================================
- Hits          233    231     -2     
+ Misses        128    126     -2     
- Partials       36     38     +2

Impacted Files	Coverage Δ
...e/LayoutRenderers/AssemblyVersionLayoutRenderer.cs	25% <0%> (+2%)	⬆️
...youtRenderers/AspNetRequestCookieLayoutRenderer.cs	80% <0%> (-4%)	⬇️
...outRenderers/AspNetLayoutMultiValueRendererBase.cs	96% <0%> (-2%)	⬇️

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