Fixed CHANGELOG.

Author: kmvanbrunt

CHANGELOG.md

@@ -109,7 +109,7 @@ prompt is displayed.
         - For more details and examples, see the [Help](docs/features/help.md) documentation and the
           `examples/default_categories.py` file.
     - `CommandSet` is now a generic class, which allows developers to parameterize it with their
-      specific `cmd2.Cmd`subclass (e.g.,`class MyCommandSet(CommandSet[MyApp]):`). This provides
+      specific `cmd2.Cmd` subclass (e.g.,`class MyCommandSet(CommandSet[MyApp]):`). This provides
       full type hints and IDE autocompletion for `self._cmd` without needing to override and cast
       the property.