Added single-item role add/remove methods

src/Discord.Net.Core/Entities/Users/IGuildUser.cs

@@ -29,8 +29,12 @@ namespace Discord
         /// <summary> Modifies this user's properties in this guild. </summary>
         Task ModifyAsync(Action<GuildUserProperties> func, RequestOptions options = null);
 
+        /// <summary> Adds a role to this user in this guild. </summary>
+        Task AddRoleAsync(IRole role, RequestOptions options = null);
         /// <summary> Adds roles to this user in this guild. </summary>
         Task AddRolesAsync(IEnumerable<IRole> roles, RequestOptions options = null);
+        /// <summary> Removes a role from this user in this guild. </summary>
+        Task RemoveRoleAsync(IRole role, RequestOptions options = null);
         /// <summary> Removes roles from this user in this guild. </summary>
         Task RemoveRolesAsync(IEnumerable<IRole> roles, RequestOptions options = null);
     }

src/Discord.Net.Rest/Entities/Users/RestGuildUser.cs

@@ -82,14 +82,20 @@ namespace Discord.Rest
             else if (args.RoleIds.IsSpecified)
                 UpdateRoles(args.RoleIds.Value.ToArray());
         }
+        public Task KickAsync(RequestOptions options = null)
+            => UserHelper.KickAsync(this, Discord, options);
+        /// <inheritdoc />
+        public Task AddRoleAsync(IRole role, RequestOptions options = null)
+            => AddRolesAsync(new[] { role }, options);
         /// <inheritdoc />
         public Task AddRolesAsync(IEnumerable<IRole> roles, RequestOptions options = null)
             => UserHelper.AddRolesAsync(this, Discord, roles, options);
         /// <inheritdoc />
+        public Task RemoveRoleAsync(IRole role, RequestOptions options = null)
+            => RemoveRolesAsync(new[] { role }, options);
+        /// <inheritdoc />
         public Task RemoveRolesAsync(IEnumerable<IRole> roles, RequestOptions options = null)
             => UserHelper.RemoveRolesAsync(this, Discord, roles, options);
-        public Task KickAsync(RequestOptions options = null)
-            => UserHelper.KickAsync(this, Discord, options);
 
         public ChannelPermissions GetPermissions(IGuildChannel channel)
         {

src/Discord.Net.WebSocket/Entities/Users/SocketGuildUser.cs

@@ -108,9 +108,15 @@ namespace Discord.WebSocket
         public Task KickAsync(RequestOptions options = null)
             => UserHelper.KickAsync(this, Discord, options);
         /// <inheritdoc />
+        public Task AddRoleAsync(IRole role, RequestOptions options = null)
+            => AddRolesAsync(new[] { role }, options);
+        /// <inheritdoc />
         public Task AddRolesAsync(IEnumerable<IRole> roles, RequestOptions options = null)
             => UserHelper.AddRolesAsync(this, Discord, roles, options);
         /// <inheritdoc />
+        public Task RemoveRoleAsync(IRole role, RequestOptions options = null)
+            => RemoveRolesAsync(new[] { role }, options);
+        /// <inheritdoc />
         public Task RemoveRolesAsync(IEnumerable<IRole> roles, RequestOptions options = null)
             => UserHelper.RemoveRolesAsync(this, Discord, roles, options);