Update readme.

README.md

@@ -18,13 +18,18 @@ print tb.send_message(281281, 'gogo power ranger')
 * Echo Bot
 
 ```python
-mport telebot
+import telebot
 import time
 
-TOKEN = '<tonke_string>'
+TOKEN = '<token_string>'
 
 
 def listener(*messages):
+    """
+    When new message get will call this function.
+    :param messages:
+    :return:
+    """
     for m in messages:
         chatid = m.chat.id
         text = m.text
@@ -33,7 +38,7 @@ def listener(*messages):
 
 tb = telebot.TeleBot(TOKEN)
 tb.get_update()  # cache exist message
-tb.set_update_listener(listener)
+tb.set_update_listener(listener) #register listener
 tb.polling(3)
 while True:
     time.sleep(20)