Update requirements.txt

[WillWcchan]

Currently following your tutorial:

https://medium.com/@markgituma/kubernetes-local-to-production-with-django-4-celery-with-redis-and-flower-df48ab9896b7

And ran into troubles deploying my celery application where it resulted in celery saying:

Traceback (most recent call last):
  File "/usr/local/bin/celery", line 8, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.7/site-packages/celery/__main__.py", line 16, in main
    _main()
  File "/usr/local/lib/python3.7/site-packages/celery/bin/celery.py", line 322, in main
    cmd.execute_from_commandline(argv)
  File "/usr/local/lib/python3.7/site-packages/celery/bin/celery.py", line 499, in execute_from_commandline
    super(CeleryCommand, self).execute_from_commandline(argv)))
  File "/usr/local/lib/python3.7/site-packages/celery/bin/base.py", line 284, in execute_from_commandline
    self.on_concurrency_setup()
  File "/usr/local/lib/python3.7/site-packages/celery/bin/celery.py", line 542, in on_concurrency_setup
    self.load_extension_commands()
  File "/usr/local/lib/python3.7/site-packages/celery/bin/celery.py", line 546, in load_extension_commands
    self.register_command).load()
  File "/usr/local/lib/python3.7/site-packages/celery/bin/base.py", line 153, in load
    for name, cls in imports.load_extension_classes(self.namespace):
  File "/usr/local/lib/python3.7/site-packages/celery/utils/imports.py", line 163, in load_extension_classes
    cls = symbol_by_name(class_name)
  File "/usr/local/lib/python3.7/site-packages/kombu/utils/imports.py", line 57, in symbol_by_name
    module = imp(module_name, package=package, **kwargs)
  File "/usr/local/lib/python3.7/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 728, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/local/lib/python3.7/site-packages/flower/command.py", line 18, in <module>
    from .app import Flower
  File "/usr/local/lib/python3.7/site-packages/flower/app.py", line 15, in <module>
    from .urls import handlers
  File "/usr/local/lib/python3.7/site-packages/flower/urls.py", line 9, in <module>
    from .api import tasks
  File "/usr/local/lib/python3.7/site-packages/flower/api/tasks.py", line 81, in <module>
    class TaskApply(BaseTaskHandler):
  File "/usr/local/lib/python3.7/s

Solved by adding these two libraries into the requirments.txt