Remove requires that should be in cases files.
Remove requires that should be in cases files.

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