Fix python 3 version used by travis
Travis now uses
[xenial](https://blog.travis-ci.com/2019-04-15-xenial-default-build-environment)
as the default build environment. The CI uses system site packages, but
this option only works with the default python 3 version. In xenial this
version is [python 3.5](https://packages.ubuntu.com/xenial/python3).
language: python
python:
- - "2.7_with_system_site_packages"
- - "3.4_with_system_site_packages"
+ - "2.7"
+ - "3.5"
+virtualenv:
+ system_site_packages: true
# command to install dependencies
install:
- pip install argparse catkin-pkg empy mock nose
