Upgrade to release 3.1.1:
- Drop support for EOL Python 3.6
- Use <caption> tags to print html table titles
- Add colorful tables and themes
- Convert None to empty cell or custom value
- Resolve "KeyError" issue on _stringify_row
Signed-off-by: Leon Anavi <leon.anavi@konsulko.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Trevor Gamblin <trevor.gamblin@windriver.com>