package/dovecot: bump version to 2.2.31

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/dovecot/dovecot.hash

@@ -1,2 +1,2 @@
 # Locally computed after checking signature
-sha256 f3dba79c1ceeaa9dd0633f648d3a607704bf3d0591e7d48168084c8add87189e  dovecot-2.2.30.2.tar.gz
+sha256 034be40907748128d65088a4f59789b2f99ae7b33a88974eae0b6a68ece376a1  dovecot-2.2.31.tar.gz

package/dovecot/dovecot.mk

@@ -5,7 +5,7 @@
 ################################################################################
 
 DOVECOT_VERSION_MAJOR = 2.2
-DOVECOT_VERSION = $(DOVECOT_VERSION_MAJOR).30.2
+DOVECOT_VERSION = $(DOVECOT_VERSION_MAJOR).31
 DOVECOT_SITE = http://www.dovecot.org/releases/$(DOVECOT_VERSION_MAJOR)
 DOVECOT_INSTALL_STAGING = YES
 DOVECOT_LICENSE = LGPL-2.1