Release 0.2.1 * Change poll interval for Hoymiles to 5 minutes * Catch and raise error when Hoymiles API data responses cannot be deserialized * Use stderr for error messages (and change prefix emoji) * Use the `serde` crate via Rocket,; drop depend on the `serde` crate itself * Also set the state class in HA sensors example * Improve deserialization of Hoymiles API responses (#7) * Prevent total energy reported decreasing for Hoymiles (#7) * Set correct `last_updated` field in status report for Hoymiles (#7) * Set cookie to configure Hoymiles API language to English (#7) * Detect when Hoymiles (login/data) API response are not correct (#7) * Small formatting, error message and documentation fixes