package/fbgrab: bump version to 1.3.1 and update projct URL

- bump version to 1.3.1
  Changelog:
  * Incorrect alpha value when converting 32-bit framebuffers.
  * Documentation for github instead of own homepage.

- update project URL

Fixes bug 12606 ([1]).

[1] https://bugs.busybox.net/show_bug.cgi?id=12606

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Tested-by: Timo Ketola <timo.ketola@exertus.fi>
Acked-by: Timo Ketola <timo.ketola@exertus.fi>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit 7e87817d2c4168e857d1a2aa4cd6b21ed080a96f)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/fbgrab/Config.in

@@ -5,4 +5,4 @@ config BR2_PACKAGE_FBGRAB
 	  FBGrab is a framebuffer screenshot program, capturing the
 	  linux frambuffer and converting it to a png-picture.
 
-	  http://fbgrab.monells.se/
+	  https://github.com/GunnarMonell/fbgrab

package/fbgrab/fbgrab.hash

@@ -1,2 +1,3 @@
 # Locally calculated
-sha256 5fab478cbf8731fbacefaa76236a8f8b38ccff920c53b3a8253bc35509fba8ed fbgrab-1.3.tar.gz
+sha256  3314a932f830e32feaf36914e1b43326529fe35b7eb7410ff55f16c930ddfbcb  fbgrab-1.3.1.tar.gz
+sha256  fa5fc1d1eec39532ea517518eeefd7b6e3c14341a55e5880a0e2a49eee47a5b7  COPYING

package/fbgrab/fbgrab.mk

@@ -4,8 +4,8 @@
 #
 ################################################################################
 
-FBGRAB_VERSION = 1.3
-FBGRAB_SITE = http://fbgrab.monells.se
+FBGRAB_VERSION = 1.3.1
+FBGRAB_SITE = $(call github,GunnarMonell,fbgrab,$(FBGRAB_VERSION))
 FBGRAB_DEPENDENCIES = libpng
 FBGRAB_LICENSE = GPL-2.0
 FBGRAB_LICENSE_FILES = COPYING