Fix for issue on windows

Author: lmcinnes

hdbscan/validity.py

@@ -154,7 +154,7 @@ def internal_minimum_spanning_tree(mr_distances):
         row[0] = candidates[0]
 
     vertices = np.arange(mr_distances.shape[0])[
-        np.bincount(min_span_tree.T[:2].flatten().astype(np.int64)) > 1]
+        np.bincount(min_span_tree.T[:2].flatten().astype(np.intp)) > 1]
     # A little "fancy" we select from the flattened array reshape back
     # (Fortran format to get indexing right) and take the product to do an and
     # then convert back to boolean type.