dovecot: update to 2.2.28

Signed-off-by: Lucian Cristian <lucian.cristian@gmail.com>

mail/dovecot/Makefile

@@ -8,12 +8,12 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=dovecot
-PKG_VERSION:=2.2.26.0
+PKG_VERSION:=2.2.28
 PKG_RELEASE:=1
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=http://www.dovecot.org/releases/2.2
-PKG_MD5SUM:=85bc42328de41d1eb8d6d3f1db666db8
+PKG_HASH:=e0288f59e326ab87cb3881fdabadafe542f4dc7ab9996db13863a439ebbc1f25
 PKG_LICENSE:=LGPL-2.1 MIT BSD-3-Clause Unique
 PKG_LICENSE_FILES:=COPYING COPYING.LGPL COPYING.MIT