check validity of long_description before publishing package to pypi

Author: gabrielfalcao

Makefile

@@ -34,6 +34,7 @@ release:
 
 pypi:
 	@pipenv run python setup.py build sdist
+	@pipenv run twine check dist/*.tar.gz
 	@pipenv run twine upload dist/*.tar.gz
 
 clean:

README.rst

@@ -29,7 +29,7 @@ Mercator actually supports extracting data from:
 
 - dictionaries
 - SQLAlchemy model instances
-- Any opaque python objects (e.g.: :py:class:`~collections.namedtuple`)
+- Any opaque python objects (e.g.: ``collections.namedtuple``)
 
 
 When should I use Mercator ?