dovecot: Add pigeonhole package

Signed-off-by: Florian Pritz <bluewind@xinu.at>

roles/dovecot/tasks/main.yml

 ---
 
 - name: install dovecot
-  pacman: name=dovecot state=present
+  pacman: name=dovecot,pigeonhole state=present
 
 - name: install dovecot.conf
   template: src=dovecot.conf.j2 dest=/etc/dovecot/dovecot.conf owner=root group=root mode=644