Fix for .NET Core 3.1

[kostelis]

FormattedLogValues are made internal and do not work anymore.

[siderisltd]

This is better than the other solution with getting the Microsoft classes as it's not breaking the TState when you want to log model

[siderisltd]

Please remove the usage of Microsoft.Extensions.Logging.Externals namespace used in the solution.

[kostas-jonauskas]

Where exactly? I cannot find where "Microsoft.Extensions.Logging.Externals" are used in the solution.

[siderisltd]

Sorry @kostas-baltsoft @kostelis, my bad - it's using Microsoft.Extensions.Logging.Internal; which is not longer available. You can see my commit where I added the original files initially. -> #5

Also in your method GetFirstValue - the field may be null so I strongly recommend you adding a null check. I've hit that while I was testing

From
var values = (object[])field.GetValue(lv);

To
var values = (object[])field?.GetValue(lv);

@cpwood can we merge his request once these changes are applied?

[kostelis]

Hey guys, sorry for a late reply. I have implemented a possible null reference check.