unjetify for private usage

android/src/main/java/com/th3rdwave/safeareacontext/SafeAreaUtils.java

 
 import java.util.Map;
 
-import androidx.annotation.Nullable;
+import android.support.annotation.Nullable;
 
 /* package */ class SafeAreaUtils {
   static WritableMap edgeInsetsToJsMap(EdgeInsets insets) {

android/src/main/java/com/th3rdwave/safeareacontext/SafeAreaView.java

 import com.facebook.infer.annotation.Assertions;
 import com.facebook.react.views.view.ReactViewGroup;
 
-import androidx.annotation.Nullable;
+import android.support.annotation.Nullable;
 
 public class SafeAreaView extends ReactViewGroup implements ViewTreeObserver.OnGlobalLayoutListener {
   public interface OnInsetsChangeListener {

android/src/main/java/com/th3rdwave/safeareacontext/SafeAreaViewManager.java

 
 import java.util.Map;
 
-import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
 
 public class SafeAreaViewManager extends ViewGroupManager<SafeAreaView> {
   private final ReactApplicationContext mContext;