v0.3.1

[0.3.1] - 2026-07-07

Documentation

• Document that KeylightConfig::builder(...).app_version(...) must be called
  explicitly to report an app version. Unlike sdk_version and platform
  (attached automatically), the app version is unknown to the SDK and is omitted
  from every request — including the keyless/free-tier beacon — unless set, which
  left it blank in the dashboard. Added a doc-comment with an example, corrected
  the README telemetry bullet, and added .app_version(env!("CARGO_PKG_VERSION"))
  to the setup examples.