Update badges [skip ci]

README.md

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 # SImMER
-[![Build Status](https://dev.azure.com/asavel/SImMER/_apis/build/status/arjunsavel.SImMER?branchName=master)](https://dev.azure.com/asavel/SImMER/_build?definitionId=1&_a=summary) [![codecov](https://codecov.io/gh/arjunsavel/simmer/branch/master/graph/badge.svg?token=5ERhXGwSDo)](https://codecov.io/gh/arjunsavel/simmer) [![Code Climate](https://img.shields.io/codeclimate/maintainability/arjunsavel/SImMER?style=flat)](https://codeclimate.com/github/arjunsavel/SImMER) [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
+[![Build Status](https://dev.azure.com/asavel/SImMER/_apis/build/status/arjunsavel.SImMER?branchName=main)](https://dev.azure.com/asavel/SImMER/_build?definitionId=1&_a=summary) [![codecov](https://codecov.io/gh/arjunsavel/simmer/branch/main/graph/badge.svg?token=eMUOVt99Gh)](https://codecov.io/gh/arjunsavel/simmer) [![Maintainability](https://api.codeclimate.com/v1/badges/d1fa9d77e8fbcc96619a/maintainability)](https://codeclimate.com/github/arjunsavel/SImMER/maintainability) [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 [![Build Status](https://readthedocs.org/projects/simmer/badge/?version=latest)](http://simmer.readthedocs.io/en/latest/?badge=latest) [![PyPI version](https://badge.fury.io/py/simmer.svg)](https://badge.fury.io/py/simmer) [![Conda Version](https://img.shields.io/conda/v/conda-forge/simmer?color=g&label=conda-forge%20%20%20%20%20&logo=conda-forge)](https://anaconda.org/conda-forge/simmer)