Update CHANGELOG.md

CHANGELOG.md

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 # Changelog
 
+## v0.5.0
+
+* Add basic Agent Health reporting by @tigrannajaryan in https://github.com/open-telemetry/opamp-spec/pull/103
+
+## v0.4.0
+
+* Simplify status compression by @tigrannajaryan in https://github.com/open-telemetry/opamp-spec/pull/102
+
+**Full Changelog**: https://github.com/open-telemetry/opamp-spec/compare/v0.3.0...v0.4.0
+
+## v0.3.0
+
+* Add ability to report general errors in PackageStatuses by @tigrannajaryan in https://github.com/open-telemetry/opamp-spec/pull/83
+* Move messages in StatusReport to AgentToServer message by @tigrannajaryan in https://github.com/open-telemetry/opamp-spec/pull/85
+* Split connection settings by types by @tigrannajaryan in https://github.com/open-telemetry/opamp-spec/pull/87
+
+**Full Changelog**: https://github.com/open-telemetry/opamp-spec/compare/v0.2.0...v0.3.0
+
+## v0.2.0
+
+* Add support for detached signatures by @tigrannajaryan in https://github.com/open-telemetry/opamp-spec/pull/69
+* Set instance_uid by Server on conflict or request for generation by @pmm-sumo in https://github.com/open-telemetry/opamp-spec/pull/63
+* Update Spec to include ServerToAgentCommand  by @dsvanlani in https://github.com/open-telemetry/opamp-spec/pull/64
+* Define that DownloadFile content hash method is SHA256 by @tigrannajaryan in https://github.com/open-telemetry/opamp-spec/pull/68
+* Add plain HTTP transport to OpAMP by @tigrannajaryan in https://github.com/open-telemetry/opamp-spec/pull/70
+* Unify addons and agent packages by @tigrannajaryan in https://github.com/open-telemetry/opamp-spec/pull/77
+* Clarify how state hashes are used between the Agent and the Server by @tigrannajaryan in https://github.com/open-telemetry/opamp-spec/pull/79
+
+**Full Changelog**: https://github.com/open-telemetry/opamp-spec/compare/v0.1.0...v0.2.0
+
 ## v0.1.0
 
 This is the first draft release of OpAMP spec.