Add screenshots taken from Chrome

dockers/Screenshotter/README.md

@@ -31,6 +31,8 @@ manually.  Example run for Firefox:
     docker stop ${container}
     docker rm ${container}
 
+For Chrome, simply replace both occurrences of `firefox` with `chrome`.
+
 ## Use without docker
 
 It is possible to run `screenshotter.js` without the use of Docker:

dockers/Screenshotter/screenshotter.sh

@@ -8,7 +8,7 @@
 # directly.
 
 status=0
-for browserTag in firefox:2.46.0; do
+for browserTag in firefox:2.46.0 chrome:2.46.0; do
     browser=${browserTag%:*}
     image=selenium/standalone-${browserTag}
     echo "Starting container for ${image}"