[docs] Add link to docs for more information

README.md

@@ -126,6 +126,7 @@ Emits `message` when a message arrives.
 | [options.webHook.key] | <code>String</code> |  | PEM private key to webHook server. |
 | [options.webHook.cert] | <code>String</code> |  | PEM certificate (public) to webHook server. |
 | [options.onlyFirstMatch] | <code>Boolean</code> | <code>false</code> | Set to true to stop after first match. Otherwise, all regexps are executed |
+| [options.request] | <code>Object</code> |  | Options which will be added for all requests to telegram api.  See https://github.com/request/request#requestoptions-callback for more information. |
 
 <a name="TelegramBot+stopPolling"></a>
 

src/telegram.js

@@ -43,6 +43,7 @@ class TelegramBot extends EventEmitter {
    * @param {String} [options.webHook.cert] PEM certificate (public) to webHook server.
    * @param {Boolean} [options.onlyFirstMatch=false] Set to true to stop after first match. Otherwise, all regexps are executed
    * @param {Object} [options.request] Options which will be added for all requests to telegram api.
+   *  See https://github.com/request/request#requestoptions-callback for more information.
    * @see https://core.telegram.org/bots/api
    */
   constructor(token, options = {}) {