Recommended changes resulting from automated audit

We performed an automated audit of your Cake addin and found that it does not follow all the best practices.

We encourage you to make the following modifications:

- [ ] We were unable to determine what version of Cake.Core your addin is referencing. Please make sure you are referencing 0.28.0
- [ ] Your addin should target netstandard2.0. Please note that there is no need to multi-target, netstandard2.0 is sufficient.
- [x] The nuget package for your addin should use the cake-contrib icon. Specifically, your addin's `.csproj` should have a line like this: `https://cdn.rawgit.com/cake-contrib/graphics/a5cf0f881c390650144b2243ae551d5b9f836196/png/cake-contrib-medium.png`.

Apologies if this is already being worked on, or if there are existing open issues, this issue was created based on what is currently published for this package on NuGet.org and in the project on github.

Start with the addin's .csproj and check its Cake.Core reference and target framework against the audit's recommendations. The issue says netstandard2.0 is sufficient and asks for Cake.Core 0.28.0; verify those project settings when done.

Written by the indexing model from the issue text.