add redis as required

README.md

@@ -8,7 +8,7 @@ Open source close combat inspired game. Presentation here: http://www.closecomba
 
 # Install
 
-OS require: build-essential libsdl1.2debian libsdl-image1.2 libsdl-image1.2-dev libsdl-ttf2.0-0 libsdl-ttf2.0-dev libsdl-mixer1.2 libsdl-mixer1.2-dev
+OS require: build-essential libsdl1.2debian libsdl-image1.2 libsdl-image1.2-dev libsdl-ttf2.0-0 libsdl-ttf2.0-dev libsdl-mixer1.2 libsdl-mixer1.2-dev redis-server
 
 Python version: 3.5+