unpin method
Unpin a message in the channel.
Implementation
Future<void> unpin(Snowflake id, {String? auditLogReason}) async {
final route = HttpRoute()
..channels(id: channelId.toString())
..pins(id: id.toString());
final request = BasicRequest(route, method: 'DELETE', auditLogReason: auditLogReason);
await client.httpHandler.executeSafe(request);
}