Update README.md

Javier Frias · web-flow · commit a748a1645737 · 2019-03-06T13:17:44.000+01:00
diff --git a/README.md b/README.md
@@ -1,5 +1,6 @@
 # PumCardGame
 An online and local multiplayer version of Bang! by Emiliano Sciarra.
+Mirror required: https://github.com/vis2k/Mirror
 
 .exe and .apk link download:
 https://drive.google.com/file/d/17KIrYVQq46SxkCarR9KFZKSC7kWkW8ay/view?usp=sharing
