• Add support for Python 3.10
• Drop support for Python 3.5
• Add null_value_handler argument to sanitize_filename/sanitize_filepath functions: #20 (Thanks to @
  mkbloke)
• Add AbstractSanitizer/AbstractValidator classes to import path
• Add replace_ansi_escape function
• Add setup-ci target to Makefile
• Modify min_len/max_len to use default values when assigned minus values