Emit backtrace for errors

src/main.rs

@@ -115,8 +115,7 @@ async fn main() {
 
 				let result = check_task(&bot, config.reminder_time, &db).await;
 				if let Err(e) = result {
-					// TODO Emitting a backtrace would be nice
-					error!("{}", e);
+					error!("{}\nBacktrace:\n{}", e, e.backtrace());
 				}
 			}
 		});