docs(release): change log for v2.7 release

Signed-off-by: Jayanth Dodderi Chidanand <jayanthdodderi.chidanand@arm.com>
Change-Id: I61828477867d7add274f080a7a493afd65611663
diff --git a/Makefile b/Makefile
index 1fe0847..6d0774e 100644
--- a/Makefile
+++ b/Makefile
@@ -6,7 +6,7 @@
 
 # TFTF Version
 VERSION_MAJOR		:= 2
-VERSION_MINOR		:= 6
+VERSION_MINOR		:= 7
 
 MAKE_HELPERS_DIRECTORY := make_helpers/
 include ${MAKE_HELPERS_DIRECTORY}build_macros.mk