fixup! pytest-timeout

Author: blueyed

.travis.yml

@@ -15,7 +15,8 @@ jobs:
         - ln -sfn "$(which python3)" /usr/local/bin/python
         - python -V
         - test $(python -c 'import sys; print("%d%d" % sys.version_info[0:2])') = 37
-        - python -m pip install pytest-timeout
+        - tox --notest
+        - .tox/py37-coverage/bin/python -m pip install pytest-timeout
 
     # Fails currently badly.
     # - python: '3.7'