Add new properties to the updated models

src/Discord.Net.Rest/API/Common/Guild.cs

@@ -45,5 +45,12 @@ namespace Discord.API
         public ulong? ApplicationId { get; set; }
         [JsonProperty("system_channel_id")]
         public ulong? SystemChannelId { get; set; }
+        [JsonProperty("premium_tier")]
+        public int PremiumTier { get; set; }
+        [JsonProperty("vanity_url_code")]
+        public string VanityURLCode { get; set; }
+        // this value is inverted, flags set will turn OFF features
+        [JsonProperty("system_channel_flags")]
+        public int SystemChannelFlags { get; set; }
     }
 }

src/Discord.Net.Rest/API/Common/GuildMember.cs

@@ -1,4 +1,4 @@
-#pragma warning disable CS1591
+#pragma warning disable CS1591
 using Newtonsoft.Json;
 using System;
 
@@ -18,5 +18,7 @@ namespace Discord.API
         public Optional<bool> Deaf { get; set; }
         [JsonProperty("mute")]
         public Optional<bool> Mute { get; set; }
+        [JsonProperty("premium_guild_since")]
+        public Optional<DateTime> PremiumSince { get; set; }
     }
 }