Issue #16 - Update the base image to the latest Fedora version

* Updated the README file

Author: ppodgorsek

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 54.0
-* Google Chrome 59.0
+* Chromium 59.0
 
 ## Running the container