package/flatbuffers: bump to version 2.0.0

https://github.com/google/flatbuffers/releases/tag/v2.0.0

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Tested-by: Maxim Kochetkov <fido_max@inbox.ru>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/flatbuffers/flatbuffers.hash

@@ -1,3 +1,3 @@
 # Locally computed:
-sha256  62f2223fb9181d1d6338451375628975775f7522185266cd5296571ac152bc45  flatbuffers-1.12.0.tar.gz
+sha256  9ddb9031798f4f8754d00fca2f1a68ecf9d0f83dfac7239af1311e4fd9a565c4  flatbuffers-2.0.0.tar.gz
 sha256  cfc7749b96f63bd31c3c42b5c471bf756814053e847c10f3eb003417bc523d30  LICENSE.txt

package/flatbuffers/flatbuffers.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-FLATBUFFERS_VERSION = 1.12.0
+FLATBUFFERS_VERSION = 2.0.0
 FLATBUFFERS_SITE = $(call github,google,flatbuffers,v$(FLATBUFFERS_VERSION))
 FLATBUFFERS_LICENSE = Apache-2.0
 FLATBUFFERS_LICENSE_FILES = LICENSE.txt