Fix link to SQLalchemy Declarative documentation.
@ -110,7 +110,7 @@ Querying is simple as well:
.. _SQLAlchemy: http://www.sqlalchemy.org/
.. _declarative:
http://docs.sqlalchemy.org/en/latest/orm/extensions/declarative.html
http://docs.sqlalchemy.org/en/latest/orm/extensions/declarative/
Manual Object Relational Mapping
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