Add support for influxdb-relay

Change-Id: I06b691b599660c1663306c6316a00de57885c848
diff --git a/README.rst b/README.rst
index c79788f..ab729ac 100644
--- a/README.rst
+++ b/README.rst
@@ -264,6 +264,29 @@
             database: mydb1
             privilege: all
 
+InfluxDB relay with HTTP outputs:
+
+.. code-block:: yaml
+
+    influxdb:
+      relay:
+        enabled: true
+        listen:
+          http_backend:
+            type: http
+            bind:
+              address: 127.0.0.1
+              port: 9096
+            output:
+              server1:
+                location: http://server1:8086/write
+                timeout: 20s
+                buffer_size_mb: 512
+                max_batch_kb: 1024
+                max_delay_interval: 30s
+              server2:
+                location: http://server2:8086/write
+  
 Read more
 =========