Fix document eternnoir#220

Author: eternnoir

README.md

@@ -445,7 +445,6 @@ The TeleBot constructor takes the following optional arguments:
 
  - threaded: True/False (default True). A flag to indicate whether
    TeleBot should execute message handlers on it's polling Thread.
- - num_threads: integer (default 4). Controls the amount of WorkerThreads created for the internal thread pool that TeleBot uses to execute message handlers. Is not used when threaded is False.
 
 ### The listener mechanism
 As an alternative to the message handlers, one can also register a function as a listener to TeleBot. Example: