Merge pull request #653 from mosdef-hub/mikemhenry-patch-2

Update gsdwriter.py

Author: daico007

mbuild/formats/gsdwriter.py

@@ -11,7 +11,7 @@
 
 def write_gsd(structure, filename, ref_distance=1.0, ref_mass=1.0,
               ref_energy=1.0, rigid_bodies=None, shift_coords=True,
-              write_special_pairs=True):
+              write_special_pairs=True, **kwargs):
     """Output a GSD file (HOOMD v2 default data format).
 
     Parameters