Issue #9 - Update Firefox to version 52.0

* Chrome had to be updated to version 57.0 too in order to allow the automatic build to work

Author: ppodgorsek

Dockerfile

@@ -12,7 +12,7 @@ RUN dnf upgrade -y\
 	&& dnf install -y\
 		chromedriver-56.0.2924.87-3.fc25\
 		firefox-52.0-4.fc25\
-		google-chrome-stable-56.0.2924.87-1\
+		google-chrome-stable-57.0.2987.110-1\
 		python-pip-8.1.2-2.fc25\
 		xorg-x11-server-Xvfb-1.19.1-3.fc25\
 	&& dnf clean all

README.md

@@ -18,7 +18,7 @@ The versions used in the latest version are:
 * Robot Framework 3.0.2
 * Robot Framework selenium2library 1.8.0
 * Firefox 52.0
-* Google Chrome 56.0
+* Google Chrome 57.0
 
 ## Running the container