[perl6/specs] 568fe5: Use .is-prime.

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/perl6/specs
  Commit: 568fe53d5fd707e7b931ab8f32437dcbf13101be
      
https://github.com/perl6/specs/commit/568fe53d5fd707e7b931ab8f32437dcbf13101be
  Author: Konrad Borowski <glitc...@myopera.com>
  Date:   2012-12-06 (Thu, 06 Dec 2012)

  Changed paths:
    M S04-control.pod

  Log Message:
  -----------
  Use .is-prime.

Today, we have .is-prime method.