Coverlet test assembly path

[ViktorHofer]

Invoking the Coverlet as a global tool and supplying a test assembly seems to not work if the test assemblies is located in the cwd and there is not current directory mark supplied .\. In example:

coverlet "System.Text.RegularExpressions.Tests.dll" --target "dotnet.exe" --targetargs "xunit.console.dll System.Text.RegularExpressions.Tests.dll ..."

The path is empty.
Parameter name: path

Seems to be related to the command line parsing library Microsoft.Extensions.CommandLineUtils. Unsure if the cwd is not recognized correctly. I would expect the test assembly to be resolvable without the cwd mark.

[tonerdo]

Fixed in #253 and available in latest releases