Remove explicit reference to System.Configuration.ConfigurationManager (#154)

Author: hazzik

RtMemoryCache/NHibernate.Caches.RtMemoryCache/NHibernate.Caches.RtMemoryCache.csproj

@@ -25,7 +25,6 @@
   </ItemGroup>
   <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard2.0' ">
     <PackageReference Include="System.Runtime.Caching" Version="4.5.0" />
-    <PackageReference Include="System.Configuration.ConfigurationManager" Version="4.5.0" />
   </ItemGroup>
   <ItemGroup>
     <Content Include="../../readme.md">