[gnome-sdk-images/gnome-3-30] Call 3.30 branch "3.30beta" for now

[Alexander Larsson <alexl src gnome org>]

commit 4771ec2a4b0101bc2e340eaaa1b0673073358244
Author: Alexander Larsson <alexl redhat com>
Date:   Wed Aug 15 17:37:35 2018 +0200

    Call 3.30 branch "3.30beta" for now

 Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/Makefile b/Makefile
index a579cea..4d691ed 100644
--- a/Makefile
+++ b/Makefile
@@ -7,7 +7,7 @@ REPO   ?= repo
 # SDK_BRANCH:          The version (branch) of runtime and sdk to produce
 # SDK_RUNTIME_VERSION: The org.freedesktop.BaseSdk and platform version to build against
 #
-SDK_BRANCH=3.30
+SDK_BRANCH=3.30beta
 SDK_RUNTIME_VERSION=18.08
 
 ifeq ($(ARCH),arm)