/// Retorna qual será próximo breakpoint.
/// @group 02
/// @param {String} $breakpoint - **Usar**: xs, sm, md ou lg
/// @example scss - Retorna o breakpoint **md**
///  next-breakpoint(sm)
@function next-breakpoint($breakpoint) {
  @if $breakpoint == "xs" {
    @return "sm";
  }
  @if $breakpoint == "sm" {
    @return "md";
  }
  @if $breakpoint == "md" {
    @return "lg";
  }
  @if $breakpoint == "lg" {
    @return "xl";
  }
}