Update to 0.76

Upstream changes:
0.76: # 2016-06-21T23:02:44+0200
- Start supporting cperl installation.
- cperl releases are sourced from: https://github.com/perl11/cperl/releases
- Deal with a regex warning when testing perlbrew with perl-5.25. See RT: https://rt.cpan.org/Ticket/Display.html?id=114871

(wen)