doh! update obsolete reference to `example.tt`
doh! update obsolete reference to `example.tt`

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