Adding updated spec test

Author: andsam

nipype/interfaces/spm/tests/test_auto_CreateWarped.py

@@ -21,6 +21,8 @@ def test_CreateWarped_inputs():
     matlab_cmd=dict(),
     mfile=dict(usedefault=True,
     ),
+    modulate=dict(field='crt_warped.jactransf',
+    ),
     paths=dict(),
     use_mcr=dict(),
     use_v8struct=dict(min_ver='8',