Each version of this integration matches a specific build of Unreal Engine 4. Here is what has changed between the 2018.1.2.6762.1124 and the 2018.1.3.6784.1153 release of the integration (in addition to upgrading to the new Unreal build).

Unreal Engine 4.19/4.20 - Wwise 2018.1.3.6784.6784.1153

• WG-36728 Added a Commandlet allowing to generate SoundBanks from the command line.
• WG-39113 Fixed: (iOS, Linux, macOS) No audio for Shipping configuration.
• WG-39715 Added a checkbox allowing to disable Spatial Audio on an AkComponent. This allows the use of SetMultiplePositions on such a component.
• WG-39833 Fixed: Reduced the number of calls to SetAuxSends when unnecessary.