rackup 1.0.1 is broken

[xjunior]

Rackup 1.0.1 is broken. The record in the changelog mentions the removal of requires, but the reality is that it removed the modules, leaving only Rackup::VERSION behind, and broke the compatibility between 1.0.0 and 1.0.1.

See lsegal/yard#1607

[ioquatix]

• Rackup 1.x is designed to be used with Rack 2.x. The files are in the Rack gem, and not in the Rackup gem.
• Rackup 2.x is designed to be used with Rack 3. The files are in the Rackup gem, and not in the Rack gem.

We did this to help with upgrades. When you install Rackup with Rack 2, you'll get an empty gem. When you update to Rack 3, the Rackup gem will go to v2 which includes files.