Set readme.md to 0.13.4

Author: Christophe Vandekerchove

README.md

@@ -4,7 +4,7 @@ Factorio Server in docker
 
 Current Version
 -----
-0.13.3
+0.13.4
 ### What's new ?
 #### Factorio
 See [factorio's site](http://www.factorio.com)