squash! fixup! Travis: report coverage with all builds

doctesting: remove changedir

With coverage 5 we could use COVERAGE_RCFILE to make it find the
.coveragerc, or we could add `--rcfile` to _PYTEST_TOX_COVERAGE_RUN, but
I've thought that this should not be the job that has to test if
`--pyargs` actually works.

Author: blueyed

tox.ini

@@ -142,13 +142,11 @@ commands =
 [testenv:doctesting]
 basepython = python
 skipsdist = True
-# ensure the given pyargs can't mean anything else
-changedir = doc/
 deps =
     PyYAML
     {env:_PYTEST_TOX_EXTRA_DEP:}
 commands =
-    {env:_PYTEST_TOX_COVERAGE_RUN:} pytest -ra en
+    {env:_PYTEST_TOX_COVERAGE_RUN:} pytest -ra doc/en
     {env:_PYTEST_TOX_COVERAGE_RUN:} pytest --doctest-modules --pyargs _pytest
 
 [testenv:regen]