Implement ISnowflakeEntity for Audit Log entries

src/Discord.Net.Core/Entities/AuditLogs/IAuditLogEntry.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
@@ -9,7 +9,7 @@ namespace Discord
     /// <summary>
     /// Represents an entry in an audit log
     /// </summary>
-    public interface IAuditLogEntry : IEntity<ulong>
+    public interface IAuditLogEntry : ISnowflakeEntity
     {
         /// <summary>
         /// The action which occured to create this entry

src/Discord.Net.Rest/Entities/AuditLogs/RestAuditLogEntry.cs

@@ -1,4 +1,5 @@
-using System.Linq;
+using System;
+using System.Linq;
 
 using Model = Discord.API.AuditLog;
 using EntryModel = Discord.API.AuditLogEntry;
@@ -26,6 +27,8 @@ namespace Discord.Rest
             return new RestAuditLogEntry(discord, fullLog, model, user);
         }
 
+        /// <inheritdoc/>
+        public DateTimeOffset CreatedAt => SnowflakeUtils.FromSnowflake(Id);
         /// <inheritdoc/>
         public ActionType Action { get; }
         /// <inheritdoc/>