TripleDES CryptographyDeprecationWarning from latest cryptography version

[der-dag]

Hi, thanks for providing puresnmp package, it is working great with my tplink switch. I just have a minor issue: After latest update of cryptography package I see all the time the following warning in my logs:

venv\Lib\site-packages\puresnmp_plugins\priv\des.py:90: CryptographyDeprecationWarning: TripleDES has been moved to cryptography.hazmat.decrepit.ciphers.algorithms.TripleDES and will be removed from cryptography.hazmat.primitives.ciphers.algorithms in 48.0.0.
  cipher = Cipher(algorithms.TripleDES(des_key), modes.CBC(init_vector))

Could the related import in des.py be fixed please or may I provide a pull request?

Thanks.