COC in read me

Author: cadenmyers13

README.rst

@@ -156,7 +156,7 @@ trying to commit again.
 
 Improvements and fixes are always appreciated.
 
-Before contributing, please read our `Code of Conduct <https://github.com/diffpy/diffpy.labpdfproc/blob/main/CODE_OF_CONDUCT.rst>`_.
+Before contributing, please read our `Code of Conduct <https://github.com/diffpy/diffpy.labpdfproc/blob/main/CODE-OF-CONDUCT.rst>`_.
 
 Contact
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