move to 0.2.1

Author: GNiendorf

setup.py

@@ -7,7 +7,7 @@
     long_description = f.read()
 
 setup(name='tracepy',
-      version='0.2.0',
+      version='0.2.1',
       description='Optical design software for python.',
       url='http://github.com/GNiendorf/tracepy',
       long_description=long_description,