url_safe Does not work

[gachikuku]

Describe the bug
When using from_base64(url_safe=True) an error is thrown.

To Reproduce
Simply run the script found here: https://github.com/securisec/chepy/blob/master/docs/examples.md#recipe-5-google-ei-timestamp

Expected behavior
I don't expect an error.

Screenshots

Desktop (please complete the following information):

• OS: Macos ARM (Darwin base.local 24.0.0 Darwin Kernel Version 24.0.0: Tue Sep 24 23:37:25 PDT 2024; root:xnu-11215.1.12~1/RELEASE_ARM64_T6030 arm64)
• Python 3.12.7
• chepy 7.2.0

Additional context

[securisec]

The url_safe argument was deprecated. The correct convention is alphabet='url_safe'.

https://chepy.readthedocs.io/en/latest/chepy.html?highlight=from_base64#chepy.Chepy.from_base64

from chepy import Chepy

c = Chepy('aGVsbG8')

c.from_base64(alphabet='url_safe')

print(c)
# prints hello