/// <summary>
/// Adds a role to a guild member.
/// </summary>
/// <param name="guildId"></param>
/// <param name="userId"></param>
/// <param name="roleId"></param>
public async ValueTask AddGuildMemberRoleAsync(
ulong guildId,
ulong userId,
ulong roleId)
{
var response = await RestClient.PutAsync(
DiscordApiRoutes.GuildMemberRole(guildId, userId, roleId))
.ConfigureAwait(false);
HandleErrors(response);
}