Fix LogEntries: collection was modified exception (#309)

* _options.LogEntries.ToArray()

* .

* update error message

src/WireMock.Net/Util/CloneUtils.cs

@@ -0,0 +1,29 @@
+using FastDeepCloner;
+using System;
+using System.Runtime.Serialization;
+
+namespace WireMock.Util
+{
+    internal static class CloneUtils
+    {
+        private static FastDeepClonerSettings settings = new FastDeepCloner.FastDeepClonerSettings()
+        {
+            FieldType = FastDeepCloner.FieldType.FieldInfo,
+            OnCreateInstance = new FastDeepCloner.Extensions.CreateInstance((Type type) =>
+            {
+#if !NETSTANDARD1_3
+                return FormatterServices.GetUninitializedObject(type);
+#else
+                
+#endif
+            })
+        };
+
+        public static T DeepClone<T>(T objectToBeCloned) where T : class
+        {
+            //return CloneExtensionsEx.CloneFactory.GetClone(objectToBeCloned);
+            // Expression.Lambda<Func<object>>(Expression.New(type)).Compile()
+            return FastDeepCloner.DeepCloner.Clone(objectToBeCloned, settings);
+        }
+    }
+}