Update README.md (paketo-buildpacks#128)

README.md

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 The Ruby Paketo Buildpack provides a set of collaborating buildpacks that
 enable the building of a Ruby-based application. These buildpacks include:
-- [MRI CNB](https://github.com/paketo-community/mri)
-- [Bundler CNB](https://github.com/paketo-community/bundler)
-- [Bundle Install CNB](https://github.com/paketo-community/bundle-install)
+- [MRI](https://github.com/paketo-community/mri)
+- [Bundler](https://github.com/paketo-community/bundler)
+- [Bundle Install](https://github.com/paketo-community/bundle-install)
+- [Puma](https://github.com/paketo-community/puma/)
+- [Thin](https://github.com/paketo-community/thin/)
+- [Unicorn](https://github.com/paketo-community/unicorn/)
+- [Rackup](https://github.com/paketo-community/rackup/)
 
 The buildpack supports building simple Ruby applications or applications which
 utilize either [Bundler](https://bundler.io/) for managing their dependencies.