fix test badges in Readme

Author: JuliaSprenger

README.rst

@@ -34,9 +34,12 @@ Code status
 .. image:: https://travis-ci.org/NeuralEnsemble/python-neo.png?branch=master
    :target: https://travis-ci.org/NeuralEnsemble/python-neo
    :alt: Core Unit Test Status (TravisCI)
-.. image:: https://github.com/NeuralEnsemble/python-neo/actions/workflows/full-test.yml/badge.svg?event=push&branch=master
+.. image:: https://github.com/NeuralEnsemble/python-neo/actions/workflows/core-test.yml/badge.svg?event=push&branch=master
    :target: https://github.com/NeuralEnsemble/python-neo/actions?query=event%3Apush+branch%3Amaster
-   :alt: IO Unit Test Status (Github Actions)
+   :alt: Core Test Status (Github Actions)
+.. image:: https://github.com/NeuralEnsemble/python-neo/actions/workflows/io-test.yml/badge.svg?event=push&branch=master
+   :target: https://github.com/NeuralEnsemble/python-neo/actions?query=event%3Apush+branch%3Amaster
+   :alt: IO Test Status (Github Actions)
 .. image:: https://coveralls.io/repos/NeuralEnsemble/python-neo/badge.png
    :target: https://coveralls.io/r/NeuralEnsemble/python-neo
    :alt: Unit Test Coverage