Merge pull request #14 from stan23/patch-1

tell user to uninstall old version before

README.md

@@ -1,6 +1,9 @@
 # hm-print
 A fork of the HomeMatic CCU Addon "ProgrammeDrucken" from https://homematic-forum.de/forum/viewtopic.php?f=41&t=19296
 
+# Installation
+:warning: Any previous version must be uninstalled manually before installing the new version.
+
 ## Supported CCU models
 * [HomeMatic CCU3](https://www.eq-3.de/produkte/homematic/zentralen-und-gateways/smart-home-zentrale-ccu3.html) / [RaspberryMatic](http://raspberrymatic.de/)
 * [HomeMatic CCU2](https://www.eq-3.de/produkt-detail-zentralen-und-gateways/items/homematic-zentrale-ccu-2.html)