Updated protocol version to fix authentication.

[cgraefe]

Updated protocol version number to 2.13.21. Fixes #1136, #1175, #1164, #1169 and possibly others.

[tgalal]

Thanks !

[kumarshivam675]

I am again unable to use yowsup library. My settings are
in file path /yowsup.common.http/warequest.py
CURRENT_ENV = S40YowsupEnv()

_VERSION = "2.13.39"
_OS_NAME= "S40"
_OS_VERSION = "14.26"
_DEVICE_NAME = "Nokia302"
_TOKEN_STRING = "PdA2DJyKoUrwLw1Bg6EIhzh502dF9noR9uFCllGk1456529096701{phone}"
_AXOLOTL = True

_MD5_CLASSES = "7UDPOXwpiLBvEjT8uNwsuA=="
_KEY = "eQV5aq/Cg63Gsq1sshN9T3gh+UUp0wIw0xgHYT1bnCjEqOJQKCRrWxdAe2yvsDeCJL+Y4G3PRD2HUF7oUgiGo8vGlNJOaux26k+A2F3hj8A="

_VERSION = "2.12.550"
_OS_NAME = "Android"
_OS_VERSION = "4.3"
_DEVICE_NAME = "GalaxyS3"
_AXOLOTL = True

I am able of connect using yowsup-cli but unable to send or receive messages. It shows message sent but I don't recieve any message. when I execute "python run.py" then I get following error:
Authentication Error: not-authorized

Can somebody help. Thanks

[assegaf]

started for 2.12.510 whatsapp use protocol 2.0 WA2.0, so wont work, @tgalal