Eslint correction

src/telegram.js

@@ -22,7 +22,7 @@ class TelegramBot extends EventEmitter {
     'location', 'new_chat_participant', 'left_chat_participant', 'new_chat_title',
     'new_chat_photo', 'delete_chat_photo', 'group_chat_created'
   ];
-  
+
   /**
    * Both request method to obtain messages are implemented. To use standard polling, set `polling: true`
    * on `options`. Notice that [webHook](https://core.telegram.org/bots/api#setwebhook) will need a SSL certificate.
@@ -372,7 +372,7 @@ class TelegramBot extends EventEmitter {
     opts.formData = content[0];
     opts.qs.document = content[1];
     if (opts.formData && Object.keys(fileOpts).length) {
-        opts.formData['document'].options = fileOpts;
+      opts.formData.document.options = fileOpts;
     }
     return this._request('sendDocument', opts);
   }