Drop perl 5.8 support in GitPrep 2.0
I decide to drop the support of perl v5.8 in GitPrep 2.0 today.
This is because I want to use latest Mojlicious, which requires perl 5.10.1+.
and because mojo-legacy project stop at 2014.
GitPrep have basic authentication bug in CGI access.
This is maybe old Mojolicious bug.
Perl 5.8 user can continue to use GitPrep 1.xx or install newly perl by using perlbrew.
This is a little pain but I believe this decision is good.