Fix syntax highlighting in readme

README.md

@@ -9,7 +9,7 @@ There is already a library called [pycdstar](https://pypi.org/project/pycdstar/)
 
 The `pycdstar3.CDStar` class closely reassembles the actual CDSTAR v3 REST API, one method per API endpoint. It provides basic connection pooling, transaction management, error handling and json parsing on top of the `requests` library, but tries to stay out of your way otherwise. Use this if you already know the CDSTAR API and need maximum control.
 
-```Python
+```python
 from pycdstar3 import CDStar
 cdstar = CDStar("https://cdstar.gwdg.de/demo/v3/", auth=("USER", "PASS"))
 
@@ -26,7 +26,7 @@ with cdstar.begin(autocommit=True):  # Wrap everything in a transaction (optiona
 
 For a more fluent and high-level approach, wrap your `CDStar` instance in a `CDStarVault`. This hides the HTTP layer behind an object-oriented API and offers convenient wrappers and methods for the most common operations.
 
-```Python
+```python
 from pycdstar3 import CDStar, CDStarVault
 cdstar = CDStar("https://cdstar.gwdg.de/demo/v3/", auth=("USER", "PASS"))