v2.4.0

• Expose the startSession method publicly. Can be used to start a session for a user interaction that happens while the app is in the background, for example, changing tracks on background audio.
• No longer starts a session if the app is in the background when the SDK is initialized. Prevents logging of silent push notifications from starting a session and counting a user visit. This changes the previous default behavior. To maintain the previous behavior, use initializeApiKey:apiKey:userId:startSession and set startSession to true.