.rultor.yml: Add empty script

Adrianzatreanu · Adrianzatreanu · commit 840058668d80 · 2016-08-17T18:36:14.000+03:00
diff --git a/.rultor.yml b/.rultor.yml
@@ -1,2 +1,3 @@
 merge:
   fast-forward: only
+  script: echo "Nothing to do."
