Update to tokio 1.0 (#529)

examples/README.md

@@ -14,7 +14,7 @@ This folder contains examples showing how to use lettre in your own projects.
 - [smtp_starttls.rs] - Send an email over SMTP with STARTTLS and authenticating with username and password.
 - [smtp_selfsigned.rs] - Send an email over SMTP encrypted with TLS using a self-signed certificate and authenticating with username and password.
 - The [smtp_tls.rs] and [smtp_starttls.rs] examples also feature `async`hronous implementations powered by [Tokio](https://tokio.rs/).
-  These files are prefixed with `tokio02_` or `tokio03_`.
+  These files are prefixed with `tokio02_` or `tokio1_`.
 
 [basic_html.rs]: ./basic_html.rs
 [maud_html.rs]: ./maud_html.rs

examples/tokio1_smtp_starttls.rs

@@ -1,11 +1,11 @@
 // This line is only to make it compile from lettre's examples folder,
 // since it uses Rust 2018 crate renaming to import tokio.
 // Won't be needed in user's code.
-use tokio03_crate as tokio;
+use tokio1_crate as tokio;
 
 use lettre::{
-    transport::smtp::authentication::Credentials, AsyncSmtpTransport, Message, Tokio03Connector,
-    Tokio03Transport,
+    transport::smtp::authentication::Credentials, AsyncSmtpTransport, Message, Tokio1Connector,
+    Tokio1Transport,
 };
 
 #[tokio::main]
@@ -23,7 +23,7 @@ async fn main() {
     let creds = Credentials::new("smtp_username".to_string(), "smtp_password".to_string());
 
     // Open a remote connection to gmail using STARTTLS
-    let mailer = AsyncSmtpTransport::<Tokio03Connector>::starttls_relay("smtp.gmail.com")
+    let mailer = AsyncSmtpTransport::<Tokio1Connector>::starttls_relay("smtp.gmail.com")
         .unwrap()
         .credentials(creds)
         .build();

examples/tokio1_smtp_tls.rs

@@ -1,11 +1,11 @@
 // This line is only to make it compile from lettre's examples folder,
 // since it uses Rust 2018 crate renaming to import tokio.
 // Won't be needed in user's code.
-use tokio03_crate as tokio;
+use tokio1_crate as tokio;
 
 use lettre::{
-    transport::smtp::authentication::Credentials, AsyncSmtpTransport, Message, Tokio03Connector,
-    Tokio03Transport,
+    transport::smtp::authentication::Credentials, AsyncSmtpTransport, Message, Tokio1Connector,
+    Tokio1Transport,
 };
 
 #[tokio::main]
@@ -23,7 +23,7 @@ async fn main() {
     let creds = Credentials::new("smtp_username".to_string(), "smtp_password".to_string());
 
     // Open a remote connection to gmail
-    let mailer = AsyncSmtpTransport::<Tokio03Connector>::relay("smtp.gmail.com")
+    let mailer = AsyncSmtpTransport::<Tokio1Connector>::relay("smtp.gmail.com")
         .unwrap()
         .credentials(creds)
         .build();