Update travis.yml to use pip's requirements.txt to install Python dependencies.
@@ -18,8 +18,7 @@ install:
- if [ "$CXX" = "g++" ]; then export CXX="g++-5" CC="gcc-5"; fi
- virtualenv --system-site-packages venv
- source venv/bin/activate
- - pip install nose
- - pip install lxml
+ - pip install -r ci/requirements.txt
# Travis-CI does not support IPv6 addresses:
script: make tests TEST_FILTER=*.*:-*.*_handles_IPv6_address*
