irb.rb

 > require './lib/super_gem'
   LoadError: cannot load such file -- super_gem/version

super_gem.rb

require 'super_gem/version'

tree.sh

.
├── lib
│   ├── super_gem
│   │   ├── board.rb
│   │   └── version.rb
│   └── super_gem.rb
└── super_gem.gemspec