conf.py: fix indentation, make flake8 happy

swh/docs/sphinx/conf.py

@@ -37,7 +37,7 @@ source_suffix = ['.rst', '.md']
 # source_suffix = '.rst'
 
 source_parsers = {
-   '.md': 'recommonmark.parser.CommonMarkParser',
+    '.md': 'recommonmark.parser.CommonMarkParser',
 }
 
 # The master toctree document.