Special characters " and ' are not supported in password

[Whitespirit0]

Hello,

I've tried for some time to make the script list images available in an authenticated registry.
Unfortunately, the output was always empty with no error message whatsoever.
After modifying the script a little bit, I realized that I was getting a 401 error.
After that, it took me some time to understand that this was because my password contains a " character, which is stripped here (as well as the ' character):

registry-cli/registry.py

Line 213 in 31112dd

password = password.strip('"').strip("'")

Would it be possible to:

1. Display an error message when the response status code is not 200.
2. Support " and ' characters in passwords or at least add a warning in the doc saying they are not supported.
3. Mention the -w option in the doc which is more secure than passing the password in the command line.

Thanks in advance!