Each version of this integration matches a specific build of Unreal Engine 4. Here is what has changed in the 2019.1.2.7018.1378 release of the integration (in addition to upgrading to the new Unreal build).

Unreal Engine 4.21/4.22 - Wwise 2019.1.2.7018.1378

• WG-42524 Ensured AK Event and RTPC sequencer tracks are not available in the Niagara editor.
• WG-42885 Exposed the External Sources API to Blueprint
• WG-43007 Exposed WAAPI IP address and port to the Wwise User Settings window.
• WG-43682 Fixed crash when closing game with active streaming sounds
• WG-43725 Fixed repeated playback of Wwise events with unknown durations.
• WG-43878 Enabled creating an AkEvent Sequencer section that is not linked to any AkEvent.
• WG-39214 Exposed Suspend and WakeupFromSuspend to FAkAudioDevice.