Fixes tvOS build issues

Correct user agent example in README

Add 24 hour detection

Removed an unused dependency

This dependency is not required. It also stops the project from being used.

Fixing `@synthesize isEmulator` duplicate

changelog update :pen:

Make 'com.google.android.gms:play-services-gcm' optional.

Added missing TypeScript methods

Added missing functions

The example needs to be updated after #207

Fix "Neither user nor current process has android.persmission.ACCESS_WIFI_STATE"

fix:  Error: The WIFI_SERVICE must be looked up on the Application context or memory will leak on devices < Android N. Try changing reactContext to reactContext.getApplicationContext()  [WifiManagerLeak] WifiManager manager = (WifiManager) reactContext.getSystemService(Context.WIFI_SERVICE);

Fix RN 0.48+ warning about requiresMainQueueSetup

Check for null with getCurrentActivity()

getCurrentActivity() occasionally returns null

Warning: Module RNDeviceInfo requires main queue setup since it overrides `constantsToExport` but doesn't implement `requiresMainQueueSetup. In a future release React Native will default to initializing all native modules on a background thread unless explicitly opted-out of.

Add flow types

Update method table with return types

Update changelog

Add tvOS support

Add Android support for serial number, IP, and MAC address.