Update to use VS2017/.Net Core tooling

[patriklindstrom]

I get errors like: src\sample\project.json: Failed to migrate XProj project Sample. Could not find project.json at L:\Dev\serilog-sinks-splunk\src\sample\project.json.
and
serilog-sinks-splunk.sln: Visual Studio needs to make non-functional changes to this project in order to enable the project to open in released versions of Visual Studio newer than Visual Studio 2010 SP1 without impacting project behavior.

[merbla]

Hi @patriklindstrom,

Thanks for dropping by. I assume you are opening this within the latest VS2017 with .Net Core tooling support. We are working through this in all our repos/sinks (>50) however it is taking some time. Please bear with us.

Please feel free to provide a PR, we have just not got to this sink as yet.

The change would include not just files but updates to

• Tests
• Build (yaml)
• TFM

[patriklindstrom]

@merbla thanks for quick reply. Ill try to look into it.

[merbla]

I will dig around another sink conversion as an example.

[patriklindstrom]

I found this info for the error for Visual Studio ".NET Cord SDK Not found...." https://github.com/aspnet/Tooling/blob/master/known-issues-vs2015.md#missing-sdk . See if it will help me get further.

[merbla]

Reference PR for migration.

[merbla]

Fixed in #48 & #49