[librsvg-oci-images] opensuse/tumbleweed: use new uri for it

[Jordan Petridis <jpetridis src gnome org>]

commit c9171fabfe7fae620bb55f9994aa05191e777c7e
Author: Jordan Petridis <jpetridis gnome org>
Date:   Sun Apr 7 18:46:20 2019 +0300

    opensuse/tumbleweed: use new uri for it
    
    Previous one got depricated it seems.

 opensuse/tumbleweed | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/opensuse/tumbleweed b/opensuse/tumbleweed
index c7de087..8963449 100644
--- a/opensuse/tumbleweed
+++ b/opensuse/tumbleweed
@@ -1,4 +1,4 @@
-FROM opensuse:tumbleweed
+FROM opensuse/tumbleweed
 
 COPY prepare.sh cleanup.sh /root/