Updated to NLog 5.0 preview 2

[snakefoot]

• Replaced platform NetCoreApp3.0 with NetCoreApp3.1
• Added platform Net5.0

[codecov-commenter]

Codecov Report

Merging #701 (1c1bbcf) into master (b98cd07) will decrease coverage by 4%.
The diff coverage is 18%.

@@          Coverage Diff          @@
##           master   #701   +/-   ##
=====================================
- Coverage      64%    61%   -4%     
=====================================
  Files          38     39    +1     
  Lines         581    624   +43     
  Branches      140    147    +7     
=====================================
+ Hits          374    379    +5     
- Misses        157    195   +38     
  Partials       50     50           

Impacted Files	Coverage Δ
...tRenderers/AspNetApplicationValueLayoutRenderer.cs	75% <ø> (ø)
...b/Targets/Wrappers/AspNetBufferingTargetWrapper.cs	0% <0%> (ø)
...LayoutRenderers/AspNetAppBasePathLayoutRenderer.cs	0% <ø> (ø)
.../Shared/LayoutRenderers/AspNetMvcActionRenderer.cs	40% <ø> (ø)
...red/LayoutRenderers/AspNetMvcControllerRenderer.cs	40% <ø> (ø)
...enderers/AspNetRequestContentTypeLayoutRenderer.cs	0% <ø> (ø)
...youtRenderers/AspNetRequestCookieLayoutRenderer.cs	87% <ø> (ø)
...LayoutRenderers/AspNetRequestFormLayoutRenderer.cs	94% <ø> (ø)
...outRenderers/AspNetRequestHeadersLayoutRenderer.cs	81% <ø> (ø)
...LayoutRenderers/AspNetRequestHostLayoutRenderer.cs	0% <ø> (ø)
... and 26 more

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