use new TLD for pytest-cov

Steve Piercy

2017-05-09 0b92dfed800117595ef00fb2847c5db9970f4cac

use new TLD for pytest-cov

 docs/quick_tutorial/unit_testing.rst

@@ -29,7 +29,7 @@
convenient than changing to your browser constantly and clicking reload.

We'll also leave discussion of `pytest-cov
<http://pytest-cov.readthedocs.org/en/latest/>`_ for another section.
<http://pytest-cov.readthedocs.io/en/latest/>`_ for another section.


Objectives