Update README.md

Author: C-Achard

README.md

@@ -99,7 +99,9 @@ If you encounter any problems, please [file an issue] along with a detailed desc
 ## Testing
 
 Before testing, install all requirements using ``pip install napari-cellseg3d[test]``.
+
 ``pydensecrf`` is also required for testing.
+
 To run tests locally:
 
 - Locally : run ``pytest`` in the plugin folder