set state_output to "changes"

Terse output is not enough for debugging.

Change-Id: Ida9a4ef0a2ad053fc370d3833d716d9e8d38d814
diff --git a/README.rst b/README.rst
index 73cdfc7..941934d 100644
--- a/README.rst
+++ b/README.rst
@@ -177,7 +177,7 @@
 
     salt:
       master:
-        state_output: terse
+        state_output: changes
 
 Salt proxy
 ----------