[Unbound] Update to 1.5.6

Bump unbound to version 1.5.6 released on October 20, 2015.

Signed-off-by: Michael Hanselmann <public@hansmi.ch>

net/unbound/Makefile

@@ -8,7 +8,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=unbound
-PKG_VERSION:=1.5.5
+PKG_VERSION:=1.5.6
 PKG_RELEASE:=1
 
 PKG_LICENSE:=BSD-3-Clause
@@ -17,7 +17,7 @@ PKG_MAINTAINER:=Michael Hanselmann <public@hansmi.ch>
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=http://www.unbound.net/downloads
-PKG_MD5SUM:=e86cccd261c1b01fa9e34cb59b0013d3
+PKG_MD5SUM:=691a34abd8e9257dd65b70f28326c1f0
 
 PKG_BUILD_DEPENDS:=libexpat
 PKG_BUILD_PARALLEL:=1