package/libgit2: bump version to 1.9.0

For release note, see:
https://github.com/libgit2/libgit2/releases/tag/v1.9.0

Signed-off-by: Nicolas Cavallari <nicolas.cavallari@green-communications.fr>
[Julien: add link to release note]
Signed-off-by: Julien Olivain <ju.o@free.fr>

package/libgit2/libgit2.hash

@@ -1,3 +1,3 @@
 # Locally calculated
-sha256  49d0fc50ab931816f6bfc1ac68f8d74b760450eebdb5374e803ee36550f26774  libgit2-1.8.4.tar.gz
+sha256  75b27d4d6df44bd34e2f70663cfd998f5ec41e680e1e593238bbe517a84c7ed2  libgit2-1.9.0.tar.gz
 sha256  e3712465634e97cfd850822a4eb5ac7d2f8a10f753189366d5a2060046f28288  COPYING

package/libgit2/libgit2.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-LIBGIT2_VERSION = 1.8.4
+LIBGIT2_VERSION = 1.9.0
 LIBGIT2_SITE = $(call github,libgit2,libgit2,v$(LIBGIT2_VERSION))
 LIBGIT2_LICENSE = \
 	GPL-2.0 with linking exception, \