docs(changelog): changelog for v2.10 release

Added changelog for v2.10 release.

Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
Signed-off-by: Juan Pablo Conde <juanpablo.conde@arm.com>
Change-Id: Id06263047fcc1ec60e82f85cd09e2e4bc95830f5
diff --git a/Makefile b/Makefile
index 5edd385..97c3c15 100644
--- a/Makefile
+++ b/Makefile
@@ -8,7 +8,7 @@
 # Trusted Firmware Version
 #
 VERSION_MAJOR			:= 2
-VERSION_MINOR			:= 9
+VERSION_MINOR			:= 10
 VERSION_PATCH			:= 0	# Only used for LTS releases
 VERSION				:= ${VERSION_MAJOR}.${VERSION_MINOR}.${VERSION_PATCH}