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
 ----------
diff --git a/salt/files/master.conf b/salt/files/master.conf
index f08763c..2ee44d9 100644
--- a/salt/files/master.conf
+++ b/salt/files/master.conf
@@ -4,7 +4,7 @@
 worker_threads: {{ master.worker_threads }}
 timeout: {{ master.command_timeout }}
 
-state_output: {{ master.get('state_output', 'terse') }}
+state_output: {{ master.get('state_output', 'changes') }}
 
 {%- if master.system is defined %}