Bug 1445469 - Update to geckodriver v0.20.0 (#3339)

https://github.com/mozilla/geckodriver/releases/tag/v0.20.0

bin/travis-setup.sh

@@ -64,7 +64,9 @@ setup_docs() {
 
 setup_geckodriver() {
     echo '-----> Installing geckodriver'
-    curl -sSfL 'https://github.com/mozilla/geckodriver/releases/download/v0.19.1/geckodriver-v0.19.1-linux64.tar.gz' | tar -zxC "${HOME}/bin"
+    GECKODRIVER_VERSION='0.20.0'
+    curl -sSfL "https://github.com/mozilla/geckodriver/releases/download/v${GECKODRIVER_VERSION}/geckodriver-v${GECKODRIVER_VERSION}-linux64.tar.gz" \
+        | tar -zxC "${HOME}/bin"
 }
 
 setup_js_env() {

vagrant/setup.sh

@@ -16,7 +16,7 @@ PYTHON_DIR="$HOME/python"
 cd "$SRC_DIR"
 
 ELASTICSEARCH_VERSION="5.5.0"
-GECKODRIVER_VERSION="0.19.1"
+GECKODRIVER_VERSION="0.20.0"
 PYTHON_VERSION="$(sed 's/python-//' runtime.txt)"
 PIP_VERSION="9.0.1"
 # Keep in sync with the version pre-installed on Travis.