• Add support setting groups for users and events. See Readme for more information.
• Add helper method getSessionId to expose the current sessionId value.
• Add logRevenueV2 and new Revenue class to support logging revenue events with properties, and revenue type. See Readme for more info.
• Fix crash when trying to enableForegroundTracking with the PinnedAmplitudeClient. AmplitudeClient methods should be using this instead of static instance variable.