use nb.save(img, filename) instead of img.save(...)

Co-Authored-By: Chris Markiewicz <effigies@gmail.com>

Author: kaczmarj

nibabel/cmdline/conform.py

@@ -62,4 +62,4 @@ def main(args=None):
         cval=0.0,
         orientation=kwargs["orientation"])
 
-    out_img.to_filename(kwargs["outfile"])
+    nb.save(out_img, kwargs["outfile"])