Add support for changing Nicknames!

User.Edit(nickname: "foo");

src/Discord.Net/API/Client/Rest/UpdateMember.cs

@@ -21,6 +21,8 @@ namespace Discord.API.Client.Rest
         public ulong? VoiceChannelId { get; set; }
         [JsonProperty("roles"), JsonConverter(typeof(LongStringArrayConverter))]
         public ulong[] RoleIds { get; set; }
+        [JsonProperty("nick")]
+        public string Nickname { get; set; }
 
         public UpdateMemberRequest(ulong guildId, ulong userId)
         {

src/Discord.Net/Models/User.cs

@@ -247,7 +247,7 @@ namespace Discord
 				LastActivityAt = activity ?? DateTime.UtcNow;
 		}
 
-        public Task Edit(bool? isMuted = null, bool? isDeafened = null, Channel voiceChannel = null, IEnumerable<Role> roles = null)
+        public Task Edit(bool? isMuted = null, bool? isDeafened = null, Channel voiceChannel = null, IEnumerable<Role> roles = null, string nickname = null)
         {
             if (Server == null) throw new InvalidOperationException("Unable to edit users in a private channel");
 
@@ -263,7 +263,8 @@ namespace Discord
                 IsMuted = isMuted ?? IsServerMuted,
                 IsDeafened = isDeafened ?? IsServerDeafened,
                 VoiceChannelId = voiceChannel?.Id,
-                RoleIds = roleIds
+                RoleIds = roleIds,
+                Nickname = nickname ?? Nickname
             };
             return Client.ClientAPI.Send(request);
         }