Update to 7.1.1

.env

-ELK_VERSION=7.0.1
+ELK_VERSION=7.1.1

README.md

 # Elastic stack (ELK) on Docker
 
 [![Join the chat at https://gitter.im/deviantony/docker-elk](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/deviantony/docker-elk?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
-[![Elastic Stack version](https://img.shields.io/badge/ELK-7.0.1-blue.svg?style=flat)](https://github.com/deviantony/docker-elk/issues/382)
+[![Elastic Stack version](https://img.shields.io/badge/ELK-7.1.1-blue.svg?style=flat)](https://github.com/deviantony/docker-elk/issues/401)
 [![Build Status](https://api.travis-ci.org/deviantony/docker-elk.svg?branch=master)](https://travis-ci.org/deviantony/docker-elk)
 
 Run the latest version of the [Elastic stack][elk-stack] with Docker and Docker Compose.
@@ -167,7 +167,7 @@ Create an index pattern via the Kibana API:
 ```console
 $ curl -XPOST -D- 'http://localhost:5601/api/saved_objects/index-pattern' \
     -H 'Content-Type: application/json' \
-    -H 'kbn-version: 7.0.1' \
+    -H 'kbn-version: 7.1.1' \
     -u elastic:<your generated elastic password> \
     -d '{"attributes":{"title":"logstash-*","timeFieldName":"@timestamp"}}'
 ```

logstash/config/logstash.yml

@@ -7,5 +7,6 @@ xpack.monitoring.elasticsearch.hosts: [ "http://elasticsearch:9200" ]
 
 ## X-Pack security credentials
 #
+xpack.monitoring.enabled: true
 xpack.monitoring.elasticsearch.username: elastic
 xpack.monitoring.elasticsearch.password: changeme