Added new arguments

[askras]

Added the following arguments:
--github_username - for prints author github username;
--email - for prints author email;
--website - for prints author or project website.

[pep8speaks]

Hello @askras! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file watermark/watermark.py:

Line 128:47: E502 the backslash is redundant between brackets
Line 129:32: E127 continuation line over-indented for visual indent

Comment last updated at 2021-12-03 22:21:55 UTC

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[rasbt]

Thanks for the PR! I was thinking whether new string arguments are really necessary vs just adding new line characters, e.g,.

watermark -p pandas,numpy -a "Sebastian Raschka \n Website: www.sebastianraschka.com \n GitHub: @rasbt"

but yeah, I think there is currently no way to make that work afaik. So, I'd say adding those is probably necessary. Thanks!