adding MIT license URL

Author: damienbod

src/WebApiContrib.Core.Formatter.Csv/WebApiContrib.Core.Formatter.Csv.csproj

@@ -20,6 +20,7 @@
     <AssemblyVersion>2.0.6</AssemblyVersion>
     <FileVersion>2.0.6</FileVersion>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
+    <PackageLicenseUrl>https://github.com/WebApiContrib/WebAPIContrib.Core/blob/master/LICENSE</PackageLicenseUrl>
   </PropertyGroup>
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard2.0' ">