/// Return the minor version number
/// @param {String} $version
/// @return {Number}
/// @example scss
///   $minor: minor('1.2.3');
///   -> 2
@function minor($version) {
  $version: clean($version);
  $chunk: str-slice($version, str-index($version, '.') + 1);
  @if str-index($chunk, '.') == null { @return false; }
  $minor: str-slice($chunk, 1, str-index($chunk, '.') - 1);
  @return _to-number($minor);
}