Bump major versions of dependencies

src/main.rs

@@ -10,7 +10,7 @@ use std::{env, fs::File, io::BufReader, sync::Arc};
 use anyhow::Result;
 use async_mutex::Mutex;
 use bot::fetch_and_announce_appointment;
-use chrono::{DateTime, NaiveDateTime, NaiveTime, TimeZone, Utc};
+use chrono::{DateTime, NaiveTime, TimeZone, Utc};
 use chrono_tz::Europe;
 use db::ChatInfo;
 use diesel::result::Error::NotFound;