anno_boxplot AttributeError for colors parameter usage due to .copy() in check_colors

[rtubelleza]

Describe the bug

• Cannot pass single colors to anno_boxplot in latest version (from 1.6.8 onwards?).
• Most likely due to _check_colors method for anno_boxplot class trying to copy the input colors string when setting self.colors
• Strings are immutable and do not have a .copy() method.
• Raises an AttributeError: 'str' object has no attribute 'copy'
• Fix: remove .copy()

To Reproduce Steps to reproduce the behavior: Create anno_boxplot with colors="white" or any single color

Expected behavior Produce single color boxplot, with no TypeErrors

[DingWB]

Thanks for reporting this bug; it has already been fixed and pushed to GitHub. You can install the latest version from GitHub, which will be released in the next version.