[TEST] Removes nibabel DeprecationWarning

Author: rmarkello

netneurotools/utils.py

@@ -238,7 +238,7 @@ def get_centroids(img, labels=None, image_space=False):
     from nilearn._utils import check_niimg_3d
 
     img = check_niimg_3d(img)
-    data = img.get_data()
+    data = np.asarray(img.dataobj)
 
     if labels is None:
         labels = np.trim_zeros(np.unique(data))