docs: codecov badge

Author: becelot

README.md

@@ -1,4 +1,4 @@
-# Hosting.de Client-Library
+# Hosting.de Client-Library [![codecov](https://codecov.io/gh/becelot/python-hde/branch/main/graph/badge.svg?token=C5SXI4B7PV)](https://codecov.io/gh/becelot/python-hde)
 
 An unofficial client library for the [hosting.de API](https://hosting.de/api/).
 
@@ -197,4 +197,4 @@ You can contribute to the project and add new endpoints that you need. However,
 * All implemented methods **MUST** be documented using reStructuredText notation.
 * All implemented methods **MUST** be typed properly
 * We require a test coverage of at least 90%, and your additions must not decrease the overall coverage of the codebase.
-* We appreciate if you use [this](https://github.com/angular/angular/blob/master/CONTRIBUTING.md) commit message format.
+* We appreciate if you use [this](https://github.com/angular/angular/blob/master/CONTRIBUTING.md) commit message format.