Decrease app update checking interval

app/src/main/java/org/koitharu/kotatsu/ui/main/MainActivity.kt

@@ -66,7 +66,7 @@ class MainActivity : BaseActivity(), NavigationView.OnNavigationItemSelectedList
 			navigationView.setCheckedItem(R.id.nav_history)
 			setPrimaryFragment(HistoryListFragment.newInstance())
 		}
-		drawer.postDelayed(4000) {
+		drawer.postDelayed(2000) {
 			AppUpdateService.startIfRequired(applicationContext)
 		}
 	}

app/src/main/java/org/koitharu/kotatsu/ui/settings/AppUpdateService.kt

@@ -90,7 +90,7 @@ class AppUpdateService : BaseService() {
 
 		private const val NOTIFICATION_ID = 202
 		private const val CHANNEL_ID = "update"
-		private val PERIOD = TimeUnit.HOURS.toMillis(10)
+		private val PERIOD = TimeUnit.HOURS.toMillis(6)
 
 		fun start(context: Context) =
 			context.startService(Intent(context, AppUpdateService::class.java))