docs: changelog for 0.3.0

CHANGELOG.md

@@ -7,6 +7,15 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Changed
+- **Breaking:** `run_device_action` (`fix_snmp`, `install_lldpd`) is gone. The driver
+  implements napalm-device-types 4.13's fix templates: `configure_snmp_agent(settings)`
+  with the caller's community and allowed sources (one `rocommunity` line each, ufw only
+  for those sources, no fixed temp file), `get_management_peer()`, and
+  `install_package(name)` as the contract says, so `ensure_package` comes from the base
+  package. Every step reads its exit status. Requires napalm-device-types 4.13.0;
+  version 0.3.0.
+
 ### Added
 - `get_system_identity()` (napalm-device-types 4.9 `SystemIdentityMixin`): the node's SMBIOS
   system UUID, product serial and board serial over the exec path, vendor placeholders