Add instructions to verify the version

Author: dannywillems

README.md

@@ -24,7 +24,7 @@ poetry add https://github.com/leakix/l9format-python#main
 
 ## Documentation
 
-```
+```python
 from l9format import l9format
 l9format.L9Event.from_dict(res)
 ```
@@ -37,3 +37,9 @@ For instance, `1.3.1-0` will be the first version for `1.3.1` and follow
 https://github.com/LeakIX/l9format/releases/tag/v1.3.1. If a change is required
 for the Python package, but is the same specification than the Go
 implementation, the next release will be `1.3.1-1`.
+The version can be verified using
+
+```python
+import l9format
+l9format.__version__
+```