README.md: fix typo

Author: mrmurilo75

README.md

@@ -70,7 +70,7 @@ from mdit_py_plugins.front_matter import front_matter_plugin
 from mdit_py_plugins.footnote import footnote_plugin
 
 md = (
-    MarkdownIt('commonmark' ,{'breaks':True,'html':True})
+    MarkdownIt('commonmark', {'breaks':True,'html':True})
     .use(front_matter_plugin)
     .use(footnote_plugin)
     .enable('table')