Add Serilog Sink icon to Serilog.Sinks.Http.LogzIo NuGet package

[augustoproiete]

The Serilog.Sinks.Http.LogzIo NuGet package doesn't yet have an icon.

I suggest using the standard icon for sinks:

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More details: https://github.com/serilog-contrib/brand

[mantasaudickas]

Icon is now added to packages:

• https://www.nuget.org/packages/Serilog.Sinks.Logz.Io/5.0.0
• https://www.nuget.org/packages/Serilog.Sinks.Http.LogzIo/2.0.0