Since version 6.1, every new release is published with a tag. This tag carries release notes, so there is no need to add release notes to the README.md anymore. The list below is the copy of old release notes.

6.0

• change data type of validPages in playerState
• add vopPlayerConfigChangedNotification
• add vopRuntimeErrorNotification

5.2

• add buttons mode to player config in start command

5.1

• add print mode to start command

5.0

• the player should send always full payload; in case of performance issues, the player should use strategies like buffer/delay/debounce; furthermore, the host can decide to ignore state messages; therefor, vopGetStateRequest and stateReportPolicy property of playerConfig in vopStartCommand are removed
• the host should manage any stop request by hiding or unloading the player; to continue, the player can be reloaded with previous responses; therefor, vopStopCommand, vopContinueCommand and the state property of playerState in vopStateChangedNotification are removed

4.0

• added directDownloadUrl in playerConfig to enable download of additional code or data by the player
• specify metadata as json-ld as described here; changed vopReadyNotification to send this metadata instead of apiVersion, notSupportedApiFeatures, supportedUnitDefinitionTypes and supportedUnitStateDataTypes

3.0

• removed vopGetStateResponse; the player should answer the vopGetStateRequestby sending vopStateChangedNotification with all data parts
• removed complete-and-valid as responseProgress value; it is assumed that no response will be reported unless it is valid, so complete will do
• made validPages and currentPage optional in playerState for players w/o paging feature
• added enabledNavigationTargets in playerConfig in vopStartCommand to let the player know whether navigation targets are enabled or not; values are the same as in vopUnitNavigationRequestedNotification
• added startPage in playerConfig in vopStartCommand to let the player jump to the previously selected page; this might also be helpful in evaluation use cases where (after the test) the given answers of items at a specific page are expected to be presented
• added navigationDeniedNotification to let the player know when the navigation failed due to presentationProgress or responseProgress
• version notation of supported unit definition types and unit state data types changed to semver with a tilde and/or a caret, separated by @.
• changed in vopUnitNavigationRequestedNotification property name targetRelative to target