Recommended changes resulting from automated audit

[Jericho]

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:

• [x] You are currently referencing Cake.Core 0.22.0. Please upgrade to 0.28.0
• [x] You are currently referencing Cake.Common 0.22.0. Please upgrade to 0.28.0
• [x] 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: <PackageIconUrl>https://cdn.rawgit.com/cake-contrib/graphics/a5cf0f881c390650144b2243ae551d5b9f836196/png/cake-contrib-medium.png</PackageIconUrl>.
• [ ] There should be a YAML file describing your addin on the cake web site. Specifically, you should add a .yml file in this repo

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.

[Jericho]

We performed a follow up automated audit of your Cake addin and found that some (or all) issues previously identified have not been resolved.

We strongly encourage you to make the modifications previously highlighted.

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.

This comment was created by a tool: Cake.AddinDiscoverer version 3.12.1

[Jericho]

Looks like you addressed all recommendations. Closing this issue and related PR.