Update README with codacy badge.

Author: arthurdouillard

README.md

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 # Continual Loader (CLLoader)
 
-[![PyPI version](https://badge.fury.io/py/clloader.svg)](https://badge.fury.io/py/clloader) [![Build Status](https://travis-ci.com/arthurdouillard/continual_loader.svg?branch=master)](https://travis-ci.com/arthurdouillard/continual_loader)
+[![PyPI version](https://badge.fury.io/py/clloader.svg)](https://badge.fury.io/py/clloader) [![Build Status](https://travis-ci.com/arthurdouillard/continual_loader.svg?branch=master)](https://travis-ci.com/arthurdouillard/continual_loader) [![Codacy Badge](https://api.codacy.com/project/badge/Grade/ae156f65a9b84816b8e708101e546b61)](https://www.codacy.com/manual/arthurdouillard/continuum?utm_source=github.com&utm_medium=referral&utm_content=arthurdouillard/continuum&utm_campaign=Badge_Grade)
 
 ## A library for PyTorch's loading of datasets in the field of Continual Learning