travis: Enable codecov coverage

This necessitates adding some basic coverage-py configuration [1] and
making sure the pytest-cov plugin uses said configuration [2]. Badges
are included.

Note that we do not run the 'coverage' tox target, which is reserved for
users.

[1] https://github.com/codecov/example-python
[2] https://bitbucket.org/ned/coveragepy/issues/512/

Signed-off-by: Stephen Finucane <stephen@that.guru>

1 files changed, 1 insertions, 1 deletions

diff --git a/tox.ini b/tox.ini
index 4b462d612..5ff3e9f33 100644
--- a/tox.ini
+++ b/tox.ini
@@ -22,7 +22,7 @@ deps =
     du14: docutils==0.14
 setenv =
     SPHINX_TEST_TEMPDIR = {envdir}/testbuild
-    coverage: PYTEST_ADDOPTS = --cov sphinx
+    coverage: PYTEST_ADDOPTS = --cov sphinx --cov-config {toxinidir}/setup.cfg
 commands=
     {envpython} -Wall tests/run.py --durations 25 {posargs}