nano: bump to version 2.4.0

Also switch to gnu mirror.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/nano/nano.hash

@@ -1,2 +1,2 @@
 # Locally calculated after checking pgp signature
-sha256	a74bf3f18b12c1c777ae737c0e463152439e381aba8720b4bc67449f36a09534	nano-2.3.6.tar.gz
+sha256	5076fb502680503e648cbdcbf2077e39fba193420ae19203f0a54cb2d94a75bd	nano-2.4.0.tar.gz

package/nano/nano.mk

@@ -4,9 +4,8 @@
 #
 ################################################################################
 
-NANO_VERSION_MAJOR = 2.3
-NANO_VERSION = $(NANO_VERSION_MAJOR).6
-NANO_SITE = http://www.nano-editor.org/dist/v$(NANO_VERSION_MAJOR)
+NANO_VERSION = 2.4.0
+NANO_SITE = $(BR2_GNU_MIRROR)/nano
 NANO_LICENSE = GPLv3+
 NANO_LICENSE_FILES = COPYING
 NANO_CONF_OPTS = --without-slang