heckmv [options] <files...>
  -c/--case <case>  : specify the case (required)
  -r/--recursive    : recurse into directories
  -d/--include-dirs : also rename directories
  -h/--help         : show this help message

Renames files using the Rust `heck` crate for
most casing conversions. Available cases:
    UPPERCASE : ignores word breaks
    lowercase : ignores word breaks
    Title Case
    Sentence case

    UpperCamelCase
    lowerCamelCase
    snake_case
    kebab-case
    SHOUTY_SNAKE_CASE
    SHOUTY-KEBAB-CASE
    Train-Case
