Merge pull request #85 from stephendonner/geckodriver

Update to latest geckodriver, 0.20.1

Author: stephendonner

Dockerfile

@@ -21,7 +21,7 @@ RUN curl -fsSLo /tmp/firefox.tar.bz2 https://download-installer.cdn.mozilla.net/
   && mv /opt/firefox /opt/firefox-$FIREFOX_VERSION \
   && ln -fs /opt/firefox-$FIREFOX_VERSION/firefox /usr/bin/firefox
 
-ENV GECKODRIVER_VERSION=0.20.0
+ENV GECKODRIVER_VERSION=0.20.1
 RUN curl -fsSLo /tmp/geckodriver.tar.gz https://github.com/mozilla/geckodriver/releases/download/v$GECKODRIVER_VERSION/geckodriver-v$GECKODRIVER_VERSION-linux64.tar.gz \
   && rm -rf /opt/geckodriver \
   && tar -C /opt -zxf /tmp/geckodriver.tar.gz \