Fix README example

Author: LukasKalbertodt

README.md

@@ -15,22 +15,15 @@ Here is a simple example (see [`example/simple.rs`](https://github.com/LukasKalb
 extern crate telegram_bot;
 
 use telegram_bot::*;
-use std::env;
 
 fn main() {
-    // Fetch environment variable with bot token
-    let token = match env::var("TELEGRAM_BOT_TOKEN") {
-        Ok(tok) => tok,
-        Err(e) =>
-            panic!("Environment variable 'TELEGRAM_BOT_TOKEN' missing! {}", e),
-    };
-
     // Create bot, test simple API call and print bot information
-    let mut bot = Bot::new(token);
-    println!("getMe: {:?}", bot.get_me());
+    let mut api = Api::from_env("TELEGRAM_BOT_TOKEN").unwrap();
+    println!("getMe: {:?}", api.get_me());
+    let mut listener = api.listener(ListeningMethod::LongPoll(None));
 
     // Fetch new updates via long poll method
-    let res = bot.long_poll(None, |bot, u| {
+    let res = listener.listen(|u| {
         // If the received update contains a message...
         if let Some(m) = u.message {
             let name = m.from.first_name;
@@ -42,11 +35,11 @@ fn main() {
                     println!("<{}> {}", name, t);
 
                     if t == "/exit" {
-                        return Err(Error::UserInterrupt);
+                        return Ok(ListeningAction::Stop);
                     }
 
                     // Answer message with "Hi"
-                    try!(bot.send_message(
+                    try!(api.send_message(
                         m.chat.id(),
                         format!("Hi, {}! You just wrote '{}'", name, t),
                         None, None, None));
@@ -56,14 +49,15 @@ fn main() {
         }
 
         // If none of the "try!" statements returned an error: It's Ok!
-        Ok(())
+        Ok(ListeningAction::Continue)
     });
 
     // When the method `long_poll` returns, its due to an error. Check it here.
     if let Err(e) = res {
         println!("An error occured: {}", e);
     }
 }
+
 ```
 You can find a bigger example in the `examples` folder.
 
@@ -92,5 +86,5 @@ Please submit pull request against the `dev` branch, unless all changes are just
 - [x] "getUpdates" and `long_poll`
 - [ ] "setWebhook" and `listen`
 - [ ] sending files ("sendAudio", "sendDocument", ...)
-- [ ] More good documentation and examples
-- [ ] Maybe think about multithreading stuff
+- [x] More good documentation and examples
+- [x] Maybe think about multithreading stuff