Update README.rst

README.rst

@@ -1,6 +1,6 @@
 |Pibooth|
 
-|PythonVersions| |PypiPackage| |Downloads| |Tests|
+|PythonVersions| |PypiPackage| |Downloads| |Tests| |Codecov|
 
 The ``pibooth`` project provides a photobooth application *out-of-the-box* in pure Python
 for Raspberry Pi. Have a look to the `wiki <https://github.com/pibooth/pibooth/wiki>`_
@@ -95,3 +95,7 @@ It means a lot to us!
 .. |Tests| image:: https://github.com/pibooth/pibooth/actions/workflows/tests.yml/badge.svg?branch=master
    :target: https://github.com/pibooth/pibooth/actions/workflows/tests.yml?query=branch%3Amaster
    :alt: Tests
+
+.. |Codecov| image:: https://codecov.io/gh/pibooth/pibooth/branch/3.x/graph/badge.svg
+    :target: https://codecov.io/gh/pibooth/pibooth
+    :alt: Codecov