Chaged Manifest file to add vendor package

Author: blankjul

MANIFEST.in

@@ -1,4 +1,4 @@
 prune .
 recursive-include pymoo *.py *.pyx *.pxd
-recursive-include pymoo/cython/vendor *.cpp *.h
+recursive-include pymoo/cython/vendor *.cpp *.h *.py
 include LICENSE Makefile