remove core from description
.. |logo| image:: https://github.com/pymedphys/pymedphys/raw/master/docs/logos/pymedphys_title.png
:target: https://docs.pymedphys.com/
-**A community effort to develop a common core package for Medical Physics
+**A community effort to develop a common library for Medical Physics
in Python and foster a culture of opening the doors on in-house software via
peer review and open source distribution**
