update to embedded license file

Author: MarkPflug

LICENSE LICENSE.txt

@@ -6,14 +6,14 @@
     <VersionPrefix>0.5.0</VersionPrefix>
     <PackageProjectUrl>https://github.com/MarkPflug/MSBuildGitHash</PackageProjectUrl>
     <PackageIconUrl>https://markpflug.github.io/MarkPflug.png</PackageIconUrl>
-    <PackageLicenseUrl>https://github.com/MarkPflug/MSBuildGitHash/blob/master/LICENSE</PackageLicenseUrl>
     <PackageTags>MSBuild Git</PackageTags>
     <RepositoryType>git</RepositoryType>
     <RepositoryUrl>https://github.com/MarkPflug/MSBuildGitHash</RepositoryUrl>
     <Authors>Mark Pflug</Authors>
     <Title>MSBuildGitHash</Title>
     <Summary>Embeds the git repository hash in your assembly.</Summary>
     <Description>MSBuild targets for compiling a Git repository hash into .NET assemblies.</Description>
+    <PackageLicenseFile>LICENSE.txt</PackageLicenseFile>
     <NoPackageAnalysis>true</NoPackageAnalysis>
     <BuildOutputTargetFolder>build</BuildOutputTargetFolder>
     <Copyright>Copyright © Mark Pflug $([System.DateTime]::UtcNow.Year)</Copyright>
@@ -26,5 +26,6 @@
     <Content Include="build\*" PackagePath="build\">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>
+    <None Include="..\LICENSE.txt" Pack="true" PackagePath=""/>
   </ItemGroup>
 </Project>