Reno: Release Notes Manager

Reno is a release notes manager designed for high-throughput, distributed development teams. It uses Git to store release notes alongside the code, facilitating detailed and accurate notes, peer review, and easy back-porting. It organizes notes into logical groups (features, bug fixes, known issues) and integrates with Sphinx for automated documentation builds. The current version is 4.1.0, with releases tied to the OpenStack development cycle, typically several times a year.