* Add pre-release badge
* Update XML spec for `<username>`
* Update exit codes
* Update XML spec for `<prompt>`
* Create migration guide
* Add a note for the previous version
* docs -> documentation
* * Format usage
* Talk to myself
* * Add deployment status badge
* Update version strings
* Update README title
* Link to the migration guide
* * Remove .NET Core version number
* Delete exe-config-file.md
* Update README.md
* migration-guide.md -> migrate-to-3-x.md