corrected a typo in superpose3d/__init__.py

superpose3d/__init__.py

@@ -8,7 +8,7 @@ def Superpose3D(aaXf_orig,   # <-- coordinates for the "frozen" object
                 aaXm_orig,   # <-- coordinates for the "mobile" object
                 aWeights=None, #<- optional weights for the calculation of RMSD
                 allow_rescale=False, # <-- attempt to rescale mobile object?
-                q = None)    # <-- optional quaternion storing the rotation
+                q = None):   # <-- optional quaternion storing the rotation
     """
     Superpose3D() takes two lists of xyz coordinates, (of the same length)
     and attempts to superimpose them using rotations, translations, and