Change default DotCover NuGet package to jetbrains.dotcover.dotnetcli…

[mortengjesing]

…tool

This allows to run DotCover on Linux without mono

Hereby, I swear that the pull-request:

• [X] Follows the contribution guidelines
• [X] Contains my own work
• [X] Is in compliance with my employer

[mortengjesing]

For reference https://blog.jetbrains.com/dotnet/2019/08/26/cross-platform-dotcover-console-runner-whats-new-dotcover-2019-2/