[perl6/specs] d419e7: Add note about post-GLR C.

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/perl6/specs
  Commit: d419e70147385886c7efe1f9b1d6054cd63db5f3
      
https://github.com/perl6/specs/commit/d419e70147385886c7efe1f9b1d6054cd63db5f3
  Author: pmichaud <pmich...@pobox.com>
  Date:   2015-06-11 (Thu, 11 Jun 2015)

  Changed paths:
    M S07-glr-draft.pod

  Log Message:
  -----------
  Add note about post-GLR C<Nil>.