Update README.md

Author: krzjoa

README.md

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 ## Quantum Computing
-* [PennyLane](https://github.com/XanaduAI/pennylane) - a library for quantum machine learning, automatic differentiation, and optimization of hybrid quantum-classical computations 
+* [PennyLane](https://github.com/XanaduAI/pennylane) - Quantum machine learning, automatic differentiation, and optimization of hybrid quantum-classical computations.
 * [QML](https://github.com/qmlcode/qml) - A Python Toolkit for Quantum Machine Learning.
 
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