Upgrade GeckoDriver to 0.19.0

Author: elgalu

CHANGELOG.md

@@ -10,7 +10,7 @@ Note image ids also change after scm-source.json has being updated which trigger
 ## TBD_DOCKER_TAG
  + **Changes:** https://github.com/elgalu/docker-selenium/compare/TBD_PREV_COMM...master (TBD_DATE)
     + Upgrade Selenium from 3.3.1 to 3.5.3
-    + Upgrade GeckoDriver from 0.15.0 to 0.18.0
+    + Upgrade GeckoDriver from 0.15.0 to 0.19.0
  + **Image tag details:**
     + Selenium version: TBD_SELENIUM_3_VERSION (TBD_SELENIUM_3_REVISION)
     + Chrome stable:  TBD_CHROME_STABLE

Dockerfile

@@ -571,7 +571,7 @@ USER root
 # GeckoDriver
 #============
 # Layer size: tiny: ~4 MB
-ENV GECKOD_VER="0.18.0" \
+ENV GECKOD_VER="0.19.0" \
     GECKOD_URL="https://github.com/mozilla/geckodriver/releases/download"
 RUN wget --no-verbose -O geckodriver.tar.gz \
      "${GECKOD_URL}/v${GECKOD_VER}/geckodriver-v${GECKOD_VER}-linux64.tar.gz" \