v0.5.0

Other changes

• Prefer .letsgo/.mod for plugin config, falling back to the legacy root file (51d12da)
• multi and env plugins adopt the shared plugin wire contract (b9d7541)

What shipped (vs v0.4.0)

size	darwin/arm64 2.4 MB → 2.5 MB (+4.1%) · windows/amd64 2.6 MB → 2.7 MB (+3.7%) · linux/amd64 2.5 MB → 2.5 MB (+3.5%) · darwin/amd64 2.5 MB → 2.6 MB (+3.2%) · darwin/arm64 2.4 MB → 2.4 MB (+2.0%)