badges [minor]

Author: csae8092

README.md

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 [![Build the docs](https://github.com/csae8092/pylobid/actions/workflows/docs.yml/badge.svg)](https://github.com/csae8092/pylobid/actions/workflows/docs.yml)
 [![flake8 Lint](https://github.com/csae8092/pylobid/actions/workflows/lint.yml/badge.svg)](https://github.com/csae8092/pylobid/actions/workflows/lint.yml)
 [![Test](https://github.com/csae8092/pylobid/actions/workflows/test.yml/badge.svg)](https://github.com/csae8092/pylobid/actions/workflows/test.yml)
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+[![codecov](https://codecov.io/gh/csae8092/pylobid/graph/badge.svg?token=52C1Z6KJHM)](https://codecov.io/gh/csae8092/pylobid)
 
 `pylobid` is a LOBID-REST-API client. [Lobid](https://lobid.org) is a web service providing data from the [GND](https://www.dnb.de/DE/Professionell/Standardisierung/GND/gnd_node.html) - Gemeinsame Normdatei of the German National Library.