Some methods are deprecated

[mohsen1565]

Hi Oleg.
I cloned the repository and found that some methods are deprecated and if I try to change their names to what's suggested by "flask_jwt_extended", it would break more things.. I think the code needs a test and update since it was based on older Python modules. Here's an example of errors I'm getting right now:

(venv) d806848@nebula-03:~/flask-jwt-auth$ FLASK_APP=run.py FLASK_DEBUG=1 flask run --host=0.0.0.0

• Serving Flask app 'run.py' (lazy loading)
• Environment: production
  WARNING: This is a development server. Do not use it in a production deployment.
  Use a production WSGI server instead.
• Debug mode: on
  Traceback (most recent call last):
  File "/home/d806848/flask-jwt-auth/venv/bin/flask", line 8, in
  sys.exit(main())
  File "/home/d806848/flask-jwt-auth/venv/lib/python3.6/site-packages/flask/cli.py", line 994, in main
  cli.main(args=sys.argv[1:])
  File "/home/d806848/flask-jwt-auth/venv/lib/python3.6/site-packages/flask/cli.py", line 600, in main
  return super().main(*args, **kwargs)
  File "/home/d806848/flask-jwt-auth/venv/lib/python3.6/site-packages/click/core.py", line 1053, in main
  rv = self.invoke(ctx)
  File "/home/d806848/flask-jwt-auth/venv/lib/python3.6/site-packages/click/core.py", line 1659, in invoke
  return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/home/d806848/flask-jwt-auth/venv/lib/python3.6/site-packages/click/core.py", line 1395, in invoke
  return ctx.invoke(self.callback, **ctx.params)
  File "/home/d806848/flask-jwt-auth/venv/lib/python3.6/site-packages/click/core.py", line 754, in invoke
  return __callback(*args, **kwargs)
  File "/home/d806848/flask-jwt-auth/venv/lib/python3.6/site-packages/click/decorators.py", line 84, in new_func
  return ctx.invoke(f, obj, *args, **kwargs)
  File "/home/d806848/flask-jwt-auth/venv/lib/python3.6/site-packages/click/core.py", line 754, in invoke
  return __callback(*args, **kwargs)
  File "/home/d806848/flask-jwt-auth/venv/lib/python3.6/site-packages/flask/cli.py", line 849, in run_command
  app = DispatchingApp(info.load_app, use_eager_loading=eager_loading)
  File "/home/d806848/flask-jwt-auth/venv/lib/python3.6/site-packages/flask/cli.py", line 324, in init
  self._load_unlocked()
  File "/home/d806848/flask-jwt-auth/venv/lib/python3.6/site-packages/flask/cli.py", line 350, in _load_unlocked
  self._app = rv = self.loader()
  File "/home/d806848/flask-jwt-auth/venv/lib/python3.6/site-packages/flask/cli.py", line 406, in load_app
  app = locate_app(self, import_name, name)
  File "/home/d806848/flask-jwt-auth/venv/lib/python3.6/site-packages/flask/cli.py", line 260, in locate_app
  import(module_name)
  File "/home/d806848/flask-jwt-auth/run.py", line 25, in
  @jwt.token_in_blacklist_loader
  AttributeError: 'JWTManager' object has no attribute 'token_in_blacklist_loader'
  (venv) d806848@nebula-03:~/flask-jwt-auth$