makefile: incrementing minor version to reflect v2.6 release

Signed-off-by: Madhukar Pappireddy <madhukar.pappireddy@arm.com>
Change-Id: Id024520bc133b9569e36b3759ebc3bd76267c618
diff --git a/Makefile b/Makefile
index 95f556a..d22e32e 100644
--- a/Makefile
+++ b/Makefile
@@ -6,7 +6,7 @@
 
 # TFTF Version
 VERSION_MAJOR		:= 2
-VERSION_MINOR		:= 5
+VERSION_MINOR		:= 6
 
 MAKE_HELPERS_DIRECTORY := make_helpers/
 include ${MAKE_HELPERS_DIRECTORY}build_macros.mk