Update README.md

Removed codeclimate shield as codeclimate seems to have disappeared

Author: sjoerdk

README.md

@@ -3,7 +3,6 @@
 [![CI](https://github.com/sjoerdk/dicomtrolley/actions/workflows/build.yml/badge.svg?branch=main)](https://github.com/sjoerdk/dicomtrolley/actions/workflows/build.yml?query=branch%3Amain)
 [![PyPI](https://img.shields.io/pypi/v/dicomtrolley)](https://pypi.org/project/dicomtrolley/)
 [![PyPI - Python Version](https://img.shields.io/pypi/pyversions/dicomtrolley)](https://pypi.org/project/dicomtrolley/)
-[![Code Climate](https://codeclimate.com/github/sjoerdk/dicomtrolley/badges/gpa.svg)](https://codeclimate.com/github/sjoerdk/dicomtrolley)
 [![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
 [![Checked with mypy](http://www.mypy-lang.org/static/mypy_badge.svg)](http://mypy-lang.org/)