Libproximity on android is using GoogleAuthUtil.getToken is deprecated

[JhonJimenez2312]

Libproximity is using GoogleAuthUtil.getToken which is deprecated.
I was try add the library to my project but because I now use a version of 'com.google.android.gms: play-services' I saw myself in the task of updating the version of the library so that it coincides with my project ,so it marks me that
import com.google.android.gms.auth.GoogleAuthException;
import com.google.android.gms.auth.GoogleAuthUtil;
import com.google.android.gms.auth.UserRecoverableAuthException;
they are not found in the version 'com.google.android.gms: play-services15.0.1'
investigating a bit I found that now the token is obtained in another way.
https://developers.google.com/identity/sign-in/android/migration-guide.