Merge branch 'RyanSinfield-patch-1'

src/CsvHelper/Configuration/ClassMap`1.cs

@@ -70,7 +70,7 @@ public virtual MemberReferenceMap References<TClassMap>(Expression<Func<TClass,
 			var stack = ReflectionHelper.GetMembers(expression);
 			if (stack.Count == 0)
 			{
-				throw new InvalidOperationException("No members were found in expression '{expression}'.");
+				throw new InvalidOperationException($"No members were found in expression '{expression}'.");
 			}
 
 			ClassMap currentClassMap = this;