dovecot: update

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:=2.2.30.2
+PKG_VERSION:=2.2.31
 PKG_RELEASE:=1
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=http://www.dovecot.org/releases/2.2
-PKG_HASH:=f3dba79c1ceeaa9dd0633f648d3a607704bf3d0591e7d48168084c8add87189e
+PKG_HASH:=034be40907748128d65088a4f59789b2f99ae7b33a88974eae0b6a68ece376a1
 PKG_LICENSE:=LGPL-2.1 MIT BSD-3-Clause Unique
 PKG_LICENSE_FILES:=COPYING COPYING.LGPL COPYING.MIT