readme: added coverage badge

.github/workflows/python.yml

@@ -55,3 +55,13 @@ jobs:
     # https://github.com/PyCQA/pylint/issues/352
     - run: pipenv run pylint tests/*
     - run: pipenv run mypy cc1101 tests
+    # >=1.9.0 to detect branch name
+    # https://github.com/coveralls-clients/coveralls-python/pull/207
+    # https://github.com/coverallsapp/github-action/issues/4#issuecomment-547036866
+    # 1.11.0 https://github.com/coveralls-clients/coveralls-python/issues/219
+    - run: pip install 'coveralls>=1.9.0,<2,!=1.11.0'
+    # https://github.com/coverallsapp/github-action/issues/30
+    # https://github.com/coverallsapp/github-action/issues/4#issuecomment-529399410
+    - run: coveralls
+      env:
+        COVERALLS_REPO_TOKEN: ${{ secrets.COVERALLS_REPO_TOKEN }}

README.md

@@ -2,6 +2,7 @@
 
 [![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
 [![CI Pipeline Status](https://github.com/fphammerle/python-cc1101/workflows/tests/badge.svg)](https://github.com/fphammerle/python-cc1101/actions)
+[![Coverage Status](https://coveralls.io/repos/github/fphammerle/python-cc1101/badge.svg?branch=master)](https://coveralls.io/github/fphammerle/python-cc1101?branch=master)
 [![Last Release](https://img.shields.io/pypi/v/cc1101.svg)](https://pypi.org/project/cc1101/#history)
 [![Compatible Python Versions](https://img.shields.io/pypi/pyversions/cc1101.svg)](https://pypi.org/project/cc1101/)
 [![DOI](https://zenodo.org/badge/292333844.svg)](https://zenodo.org/badge/latestdoi/292333844)