Added: - notifications: Notification related Prometheus metrics - registry: Make minimum TLS version user configurable - registry/storage: Support BYOK for OSS storage driver Changed: - Upgrade to Go 1.13 - Switch to Go Modules for dependency management - registry/handlers: Log authorized username in push/pull requests Fixed: - configuration: Fix pointer initialization in configuration parser - registry/handlers: Process Accept header MIME types in case-insensitive way