Update README.md

typo

Author: molshape

README.md

@@ -23,7 +23,7 @@ Python class to manage, check and sort CAS Registry Numbers® (CAS RN®).
 
 	pip install casregnum
 
-In order to uninstall **ChemFormula** from your local environment use
+In order to uninstall **casregnum** from your local environment use
 
 	pip uninstall casregnum