Update README.md

We need to specify the variable url when calling enqueue

README.md

@@ -47,7 +47,7 @@ See [API Reference](https://pylacus.readthedocs.io/en/latest/api_reference.html)
 from pylacus import PyLacus
 
 lacus = PyLacus("http://127.0.0.1:7100")
-uuid = lacus.enqueue('google.fr')
+uuid = lacus.enqueue(url='google.fr')
 ```
 
 ## Status of a capture