test: auto sync chromedriver / chrome versions

Author: josh

.travis.yml

@@ -101,7 +101,9 @@ base_acceptance: &acceptance_default
     - ./bin/yarn install --pure-lockfile
     - python setup.py install_egg_info
     - pip install -U -e ".[dev,tests,optional]"
-    - wget -N "https://chromedriver.storage.googleapis.com/$(curl https://chromedriver.storage.googleapis.com/LATEST_RELEASE_75)/chromedriver_linux64.zip" -P ~/
+    - |
+      CHROME_MAJOR_VERSION="$(dpkg -s google-chrome-stable | sed -nr 's/Version: ([0-9]+).*/\1/p')"
+      wget -N "https://chromedriver.storage.googleapis.com/$(curl https://chromedriver.storage.googleapis.com/LATEST_RELEASE_${CHROME_MAJOR_VERSION})/chromedriver_linux64.zip" -P ~/
     - unzip ~/chromedriver_linux64.zip -d ~/
     - rm ~/chromedriver_linux64.zip
     - sudo install -m755 ~/chromedriver /usr/local/bin/