docs(release): change log for v2.8 release

Signed-off-by: Juan Pablo Conde <juanpablo.conde@arm.com>
Change-Id: I4557c69117d5796a4fdb616ab78f0476ea2cf448
diff --git a/Makefile b/Makefile
index 4af1b2a..286a47c 100644
--- a/Makefile
+++ b/Makefile
@@ -6,7 +6,7 @@
 
 # TFTF Version
 VERSION_MAJOR		:= 2
-VERSION_MINOR		:= 7
+VERSION_MINOR		:= 8
 
 MAKE_HELPERS_DIRECTORY := make_helpers/
 include ${MAKE_HELPERS_DIRECTORY}build_macros.mk