overhaul 'hard-coded test suites' section of README
overhaul 'hard-coded test suites' section of README

which wasn't about hard-coded test suites :)

Insti/exercism-ruby,NeimadTL/ruby,exercism/xruby,NeimadTL/ruby,Insti/exercism-ruby,Insti/exercism-ruby,Insti/xruby,NeimadTL/ruby,exercism/xruby,Insti/xruby