[elpa] externals/setup updated (39accbf -> 8712651)

[Stefan Monnier]

monnier pushed a change to branch externals/setup.

      from  39accbf   Mention GitHub mirror
       new  c6db23a   Use macroexpand-all instead of cl-macrolet
       new  3b35ee7   Remove cl-lib code
       new  f18dabb   Directly modify setup's edebug-form-spec
       new  a6ef318   Fix indentation in example section
       new  8712651   Allow :repeatable to guess function arity


Summary of changes:
 README.md |   8 +---
 setup.el  | 127 +++++++++++++++++++++++++++-----------------------------------
 2 files changed, 58 insertions(+), 77 deletions(-)