Update nipype/interfaces/mrtrix3/tracking.py

Co-Authored-By: jguillon <jeremy.guillon@etu.upmc.fr>

Author: effigies

nipype/interfaces/mrtrix3/tracking.py

@@ -82,7 +82,7 @@ class TractographyInputSpec(MRTrix3BaseInputSpec):
               'selected and written to the output file'))
     select = traits.Int(
         argstr='-select %d',
-        min_ver=3,
+        min_ver='3',
         desc=('set the desired number of tracks. The program will continue'
               ' to generate tracks until this number of tracks have been '
               'selected and written to the output file'))