add build badge to readme

.drone.yml

@@ -31,4 +31,4 @@ steps:
 volumes:
   - name: docker-socket
     host:
-      path: /var/run/docker.sock
+      path: /var/run/docker.sock

README.md

@@ -1,5 +1,7 @@
 # Minebot
 
+[![Build Status](https://drone.jfmonty2.com/api/badges/jfmonty2/minebot/status.svg)](https://drone.jfmonty2.com/jfmonty2/minebot)
+
 Discord bot for controlling a Heavynode minecraft server.
 
 Currently implemented commands: