Log Message:
Updated py-test-cov to 2.5.1.

2.5.1 (2017-05-11)
------------------

* Fixed xdist breakage (regression in ``2.5.0``).
  Fixes `#157 <https://github.com/pytest-dev/pytest-cov/issues/157>`_.
* Allow setting custom ``data_file`` name in ``.coveragerc``.
  Fixes `#145 <https://github.com/pytest-dev/pytest-cov/issues/145>`_.
  Contributed by Jannis Leidel & Ionel Cristian Mărieș in
  `#156 <https://github.com/pytest-dev/pytest-cov/pull/156>`_.

2.5.0 (2017-05-09)
------------------

* Always show a summary when ``--cov-fail-under`` is used. Contributed by \ 
Francis Niu in `PR#141
  <https://github.com/pytest-dev/pytest-cov/pull/141>`_.
* Added ``--cov-branch`` option. Fixes `#85 \ 
<https://github.com/pytest-dev/pytest-cov/issues/85>`_.
* Improve exception handling in subprocess setup. Fixes `#144 \ 
<https://github.com/pytest-dev/pytest-cov/issues/144>`_.
* Fixed handling when ``--cov`` is used multiple times. Fixes `#151 \ 
<https://github.com/pytest-dev/pytest-cov/issues/151>`_.