Update intro.rst

As stated on kvesteri#101, quickstart example doesn't work as is. I've adapted the snippet to let it work without problem if someone copy and paste it.
tsantanaDH · Mar 5, 2018 · 7181ffa · 7181ffa
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commit 7181ffa
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/docs/intro.rst b/docs/intro.rst
@@ -54,7 +54,7 @@ In order to make your models versioned you need two things:
     from sqlalchemy_continuum import make_versioned
 
 
-    make_versioned()
+    make_versioned(user_cls=None)
 
 
     class Article(Base):