Implement ModifyAsync behavior

src/Discord.Net.Rest/API/Rest/ModifyGuildParams.cs

@@ -1,4 +1,4 @@
-#pragma warning disable CS1591
+#pragma warning disable CS1591
 using Newtonsoft.Json;
 
 namespace Discord.API.Rest
@@ -28,5 +28,7 @@ namespace Discord.API.Rest
         public Optional<ulong?> AfkChannelId { get; set; }
         [JsonProperty("owner_id")]
         public Optional<ulong> OwnerId { get; set; }
+        [JsonProperty("explicit_content_filter")]
+        public Optional<ExplicitContentFilterLevel> ExplicitContentFilter { get; set; }
     }
 }

src/Discord.Net.Rest/Entities/Guilds/GuildHelper.cs

@@ -32,7 +32,8 @@ namespace Discord.Rest
                 Icon = args.Icon.IsSpecified ? args.Icon.Value?.ToModel() : Optional.Create<ImageModel?>(),
                 Name = args.Name,
                 Splash = args.Splash.IsSpecified ? args.Splash.Value?.ToModel() : Optional.Create<ImageModel?>(),
-                VerificationLevel = args.VerificationLevel
+                VerificationLevel = args.VerificationLevel,
+                ExplicitContentFilter = args.ExplicitContentFilter
             };
 
             if (args.AfkChannel.IsSpecified)
@@ -60,6 +61,9 @@ namespace Discord.Rest
             if (!apiArgs.Icon.IsSpecified && guild.IconId != null)
                 apiArgs.Icon = new ImageModel(guild.IconId);
 
+            if (args.ExplicitContentFilter.IsSpecified)
+                apiArgs.ExplicitContentFilter = args.ExplicitContentFilter.Value;
+
             return await client.ApiClient.ModifyGuildAsync(guild.Id, apiArgs, options).ConfigureAwait(false);
         }
         /// <exception cref="ArgumentNullException"><paramref name="func"/> is <c>null</c>.</exception>