docs(changelog): generate changelog

For future reference, this changelog was generated with the following
command:

    npm run release -- --skip.commit --skip.tag --release-as 2.6.0

Change-Id: Idf6be5c3be15ddfdb1d32fafb9e0e4b399b269f3
Signed-off-by: Chris Kay <chris.kay@arm.com>
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
diff --git a/Makefile b/Makefile
index 4905291..73007b4 100644
--- a/Makefile
+++ b/Makefile
@@ -8,7 +8,7 @@
 # Trusted Firmware Version
 #
 VERSION_MAJOR			:= 2
-VERSION_MINOR			:= 5
+VERSION_MINOR			:= 6
 
 # Default goal is build all images
 .DEFAULT_GOAL			:= all