Update edition to 2021

- Remove TryFrom/Into and FromIterator imports
- Prevent impl_validator_using_provider macro in sasl crate from
  constructing trait object

Signed-off-by: Maxime “pep” Buquet <pep@bouah.net>

xmpp/src/lib.rs

@@ -10,7 +10,6 @@ use futures::stream::StreamExt;
 use reqwest::{
     header::HeaderMap as ReqwestHeaderMap, Body as ReqwestBody, Client as ReqwestClient,
 };
-use std::convert::TryFrom;
 use std::path::{Path, PathBuf};
 use std::sync::{Arc, RwLock};
 use tokio::fs::File;

xmpp/src/pubsub/avatar.rs

@@ -6,7 +6,6 @@
 
 use super::Agent;
 use crate::Event;
-use std::convert::TryFrom;
 use std::fs::{self, File};
 use std::io::{self, Write};
 use tokio_xmpp::parsers::{

xmpp/src/pubsub/mod.rs

@@ -6,7 +6,6 @@
 
 use super::Agent;
 use crate::Event;
-use std::convert::TryFrom;
 use std::str::FromStr;
 use tokio_xmpp::parsers::{
     bookmarks2::{Autojoin, Conference},