Update README to clarify Percentify as a package

Author: Daniel15568

README.md

@@ -5,7 +5,7 @@
 [![License](https://img.shields.io/pypi/l/percentify.svg?style=flat&color=orange)](LICENSE)
 [![Build Status](https://github.com/data-centt/percentify/actions/workflows/python-app.yml/badge.svg)](https://github.com/data-centt/percentify/actions/workflows/python-app.yml)
 
-**Percentify** is a Python helper that turns *"part of a whole"* into a clean percentage.  
+**Percentify** is a Python package that turns *"part of a whole"* into a clean percentage.  
 Stop typing `(part / whole) * 100` and worrying about division by zero.
 
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