Update to 7.6.0

Closes #473

.env

@@ -1 +1 @@
-ELK_VERSION=7.5.1
+ELK_VERSION=7.6.0

README.md

@@ -1,7 +1,7 @@
 # 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-7.5.1-blue.svg?style=flat)](https://github.com/deviantony/docker-elk/issues/462)
+[![Elastic Stack version](https://img.shields.io/badge/ELK-7.6.0-blue.svg?style=flat)](https://github.com/deviantony/docker-elk/issues/473)
 [![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.
@@ -220,7 +220,7 @@ Create an index pattern via the Kibana API:
 ```console
 $ curl -XPOST -D- 'http:https://localhost:5601/api/saved_objects/index-pattern' \
  -H 'Content-Type: application/json' \
- -H 'kbn-version: 7.5.1' \
+ -H 'kbn-version: 7.6.0' \
  -u elastic:<your generated elastic password> \
  -d '{"attributes":{"title":"logstash-*","timeFieldName":"@timestamp"}}'
 ```

docker-stack.yml

@@ -3,7 +3,7 @@ version: '3.3'
 services:
 
  elasticsearch:
- image: docker.elastic.co/elasticsearch/elasticsearch:7.5.1
+ image: docker.elastic.co/elasticsearch/elasticsearch:7.6.0
  ports:
  - "9200:9200"
  - "9300:9300"
@@ -23,7 +23,7 @@ services:
  replicas: 1
 
  logstash:
- image: docker.elastic.co/logstash/logstash:7.5.1
+ image: docker.elastic.co/logstash/logstash:7.6.0
  ports:
  - "5000:5000"
  - "9600:9600"
@@ -41,7 +41,7 @@ services:
  replicas: 1
 
  kibana:
- image: docker.elastic.co/kibana/kibana:7.5.1
+ image: docker.elastic.co/kibana/kibana:7.6.0
  ports:
  - "5601:5601"
  configs: