update drone.yml

drone.yml

   when:
     event: [ push, tag ]
   environment:
-    BUILDDEPS: build-essential libc6-dev libhidapi-dev libssl-dev   
+    BUILDDEPS: build-essential libc6-dev libhidapi-dev libssl-dev zip
     MAKEFLAGS: -j 4
     MAKEDIRS: src          src/contrib
     BINARIES: src/radangel src/contrib/websockify