Upgrading NH Core to 5.2.1

Author: RogerKratz

Src/NHibernate.Envers/NHibernate.Envers.csproj

@@ -18,6 +18,6 @@
     <DebugType>Portable</DebugType>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="NHibernate" Version="[5.2.0,5.3.0)" />
+    <PackageReference Include="NHibernate" Version="[5.2.1, 5.3.0)" />
   </ItemGroup>
 </Project>