'bold' option is not working

[niguiecandy]

Hi,
first of all I'd like to thank you for a great tool.
I tried to use the formatter and encountered an issue that seems to be a bug.
In your documentation the bold/bright font can be set using following format :

bold, bold_{color}, fg_bold_{color}, bg_bold_{color}: Bold/bright colors.

When set, the output log turns gray.
Since thin option works as expected, there seems to be a bug on bold style.

[borntyping]

These codes can be extremely dependent on the terminal you're using and it's configuration. A lot of terminals allow uses to disable bold fonts.

I've added a sample script that might help debugging issues like this: https://github.com/borntyping/python-colorlog/blob/main/doc/colors.py

This currently works as far as I can tell, but feel free to open a new issue if you can provide some steps to reproduce the problem.