android studio 3.3.1 and google admob change

change/update google service library:

• com.google.android.gms:play-services-ads:16.0.0 -> com.google.android.gms:play-services-ads:17.1.2
• com.google.android.gms:play-services-auth:16.0.0 -> com.google.android.gms:play-services-auth:16.0.1

To import and use google admob (service-ads), you must add this into application manifest:
<manifest>
<application
...
>
<meta-data
android:name="com.google.android.gms.ads.APPLICATION_ID"
android:value="ca-app-pub-################~##########"/>
...
</application>