[release] v1.3.0 - Add setGlobalUser, initializeSync, updateAsync and scheduleBackgroundUpdates (#61)

### New Features
- Adds ability to set a global user which will be used for all following
checks if no user is supplied to the checks
- Add updateAsync function which will fetch the config specs from
network when called
- Adds initializeSync function which allows passing the initial specs
and does not call the network
- Adds scheduleBackgroundUpdates function which will start a job to poll
for new config specs at the specified frequency





>Included In This Release
>- e581e1c sroyal-statsig
>   - Add Function to Schedule Background Updates (#60)
>- b45e2d9 sroyal-statsig
>   - Add InitializeSync and UpdateAsync (#59)
>- 6c75d7d sroyal-statsig
>   - Add Support for Global User (#58)

Author: sroyal-statsig

gradle.properties

@@ -1,3 +1,3 @@
 android.useAndroidX=true
-libraryVersion=1.2.0
+libraryVersion=1.3.0
 kotlinVersion=1.5.0