Package nuspec only contains a deprecated licenseUrl

[Corniel]

Please update the NuSpec file of the package, using a <licenseExpression> and a <licenseFile> instead of the <licenseUrl> that has been deprecated for more than 7 years now.

<package xmlns="http://schemas.microsoft.com/packaging/2011/08/nuspec.xsd">
  <metadata>
    <id>SerilogAnalyzer</id>
    <version>0.15.0.0</version>
    <title>Serilog Analyzer</title>
    <authors>Robin</authors>
    <owners>Robin</owners>
    <licenseUrl>https://github.com/Suchiman/SerilogAnalyzer/blob/master/LICENSE</licenseUrl>
    <projectUrl>https://github.com/Suchiman/SerilogAnalyzer</projectUrl>
    <iconUrl>https://raw.githubusercontent.com/Suchiman/SerilogAnalyzer/master/SerilogAnalyzer/SerilogAnalyzer.Vsix/analyzer-200px.png</iconUrl>
    <requireLicenseAcceptance>false</requireLicenseAcceptance>
    <description>Roslyn-based analysis for code using the Serilog logging library. Checks for common mistakes and usage problems.</description>
    <copyright>Copyright 2016 Robin Sue</copyright>
    <tags>Serilog, analyzers</tags>
    <frameworkAssemblies>
      <frameworkAssembly assemblyName="System" targetFramework="" />
    </frameworkAssemblies>
  </metadata>
</package>

See Proj0500: Only include packages with an explicitly defined license