Make release 1.0.0-rc1!

Signed-off-by: Jon Loeliger
diff --git a/Makefile b/Makefile
index 24ce91a..7d27de9 100644
--- a/Makefile
+++ b/Makefile
@@ -11,7 +11,7 @@
 VERSION = 1
 PATCHLEVEL = 0
 SUBLEVEL = 0
-EXTRAVERSION =
+EXTRAVERSION =-rc1
 LOCAL_VERSION =
 CONFIG_LOCALVERSION =