optimise imports

android/src/main/java/fr/greweb/reactnativeviewshot/ViewShot.java

 import android.content.Intent;
 import android.graphics.Bitmap;
 import android.graphics.Canvas;
-import android.graphics.Color;
-import android.graphics.Matrix;
-import android.graphics.Rect;
 import android.net.Uri;
 import android.util.Base64;
-import android.util.Log;
 import android.view.TextureView;
 import android.view.View;
 import android.view.ViewGroup;
-import android.widget.LinearLayout;
 import android.widget.ScrollView;
 
 import com.facebook.react.bridge.Promise;