Update NHibernate to 5.6

Author: dennis-gr

Src/NHibernate.Envers.Tests/Entities/CustomType/PrimitiveTestUserType.cs

@@ -33,12 +33,6 @@ public override object Get(DbDataReader rs, int index, ISessionImplementor sessi
 			return PrimitiveImmutableType.Get(value);
 		}
 
-		public override object Get(DbDataReader rs, string name, ISessionImplementor session)
-		{
-			var ordinal = rs.GetOrdinal(name);
-			return Get(rs, ordinal, session);
-		}
-
 		public override string Name => "PrimitiveImmutableType";
 
 		public override System.Type ReturnedClass => typeof(PrimitiveImmutableType);

Src/NHibernate.Envers/Configuration/Fluent/FluentException.cs

@@ -17,9 +17,5 @@ public FluentException(string message) : base(message)
 		public FluentException(string message, Exception inner) : base(message, inner)
 		{
 		}
-
-		protected FluentException(SerializationInfo info, StreamingContext context) : base(info, context)
-		{
-		}
 	}
 }

Src/NHibernate.Envers/Exceptions/AuditException.cs

@@ -19,10 +19,5 @@ public AuditException(string message, Exception innerException)
 						: base(message, innerException)
 		{
 		}
-
-		protected AuditException(SerializationInfo info, StreamingContext context) 
-						: base(info, context)
-	    {
-		}
 	}
 }

Src/NHibernate.Envers/NHibernate.Envers.csproj

@@ -18,6 +18,6 @@
     <DebugType>Portable</DebugType>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="NHibernate" Version="[5.5.0, 5.6.0)" />
+    <PackageReference Include="NHibernate" Version="[5.6.0, 5.7.0)" />
   </ItemGroup>
 </Project>