release: Zephyr v1.8-rc1

Signed-off-by: Anas Nashif <anas.nashif@intel.com>
diff --git a/Makefile b/Makefile
index 470694c..a1a8e5c 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 VERSION_MAJOR 	   = 1
-VERSION_MINOR 	   = 7
-PATCHLEVEL 	   = 99
-VERSION_RESERVED   = 0
+VERSION_MINOR 	   = 8
+PATCHLEVEL 	   = 0
+VERSION_RESERVED   = rc1
 EXTRAVERSION       =
 NAME 		   = Zephyr Kernel