Add proxy to readme.

README.md

@@ -25,6 +25,7 @@
     * [The listener mechanism](#the-listener-mechanism)
     * [Using web hooks](#using-web-hooks)
     * [Logging](#logging)
+    * [Proxy](#proxy)
   * [F.A.Q.](#faq)
     * [Bot 2.0](#bot-20)
     * [How can I distinguish a User and a GroupChat in message.chat?](#how-can-i-distinguish-a-user-and-a-groupchat-in-messagechat)
@@ -492,6 +493,16 @@ logger = telebot.logger
 telebot.logger.setLevel(logging.DEBUG) # Outputs debug messages to console.
 ```
 
+### Proxy
+
+You can use proxy for request. `apihelper.proxy` object will use by call `requests` proxies argument.
+
+```python
+from telebot import apihelper
+
+apihelper.proxy = {'http', 'http://10.10.1.10:3128'}
+```
+
 ## F.A.Q.
 
 ### Bot 2.0

telebot/apihelper.py

@@ -19,6 +19,7 @@ from telebot import util
 
 logger = telebot.logger
 req_session = requests.session()
+proxy = None
 
 API_URL = "https://api.telegram.org/bot{0}/{1}"
 FILE_URL = "https://api.telegram.org/file/bot{0}/{1}"
@@ -47,7 +48,7 @@ def _make_request(token, method_name, method='get', params=None, files=None, bas
         if 'timeout' in params: read_timeout = params['timeout'] + 10
         if 'connect-timeout' in params: connect_timeout = params['connect-timeout'] + 10
     result = req_session.request(method, request_url, params=params, files=files,
-                                 timeout=(connect_timeout, read_timeout))
+                                 timeout=(connect_timeout, read_timeout), proxies=proxy)
     logger.debug("The server returned: '{0}'".format(result.text.encode('utf8')))
     return _check_result(method_name, result)['result']