Bump rev to 0.50pre.
diff --git a/busybox.spec b/busybox.spec
index 6bccd37..5d143f0 100644
--- a/busybox.spec
+++ b/busybox.spec
@@ -1,5 +1,5 @@
 Name: busybox
-Version: 0.49
+Version: 0.50pre
 Release: 1
 Group: System/Utilities
 Summary: BusyBox is a tiny suite of Unix utilities in a multi-call binary.