Add `tmuxido --update` command to update binary from latest release.
- New `self_update` module with version comparison
- Atomic binary replacement with backup/rollback
- Fetches latest release from Gitea API
- Downloads correct binary for system architecture
Drone CI substitutes ${VAR} in commands before the shell runs.
Since TAG is a local shell variable (not a Drone var), ${TAG} was
replaced with an empty string, causing the awk pattern to match
nothing and the release body to be empty.
Fix: read DRONE_TAG directly inside awk via ENVIRON["DRONE_TAG"]
and strip the v-prefix with gsub — no intermediate shell variable needed.
Also translate CHANGELOG.md to English.
- Filtro de ref corrigido: [0-9]* → v* para bater em tags "v0.3.0"
- awk agora strip o prefixo 'v' de DRONE_TAG antes de buscar no CHANGELOG
- Adiciona entrada 0.3.0 no CHANGELOG.md
