Update to v7.11.1 (#577)

.env

-ELK_VERSION=7.11.0
+ELK_VERSION=7.11.1

README.md

 # Elastic stack (ELK) on Docker
 
-[![Elastic Stack version](https://img.shields.io/badge/Elastic%20Stack-7.11.0-00bfb3?style=flat&logo=elastic-stack)](https://www.elastic.co/blog/category/releases)
+[![Elastic Stack version](https://img.shields.io/badge/Elastic%20Stack-7.11.1-00bfb3?style=flat&logo=elastic-stack)](https://www.elastic.co/blog/category/releases)
 [![Build Status](https://github.com/deviantony/docker-elk/workflows/CI/badge.svg?branch=main)](https://github.com/deviantony/docker-elk/actions?query=workflow%3ACI+branch%3Amain)
 [![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)
 
@@ -256,7 +256,7 @@ 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: 7.11.0' \
+    -H 'kbn-version: 7.11.1' \
     -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:7.11.0
+    image: docker.elastic.co/elasticsearch/elasticsearch:7.11.1
     ports:
       - "9200:9200"
       - "9300:9300"
@@ -25,7 +25,7 @@ services:
       replicas: 1
 
   logstash:
-    image: docker.elastic.co/logstash/logstash:7.11.0
+    image: docker.elastic.co/logstash/logstash:7.11.1
     ports:
       - "5044:5044"
       - "5000:5000"
@@ -44,7 +44,7 @@ services:
       replicas: 1
 
   kibana:
-    image: docker.elastic.co/kibana/kibana:7.11.0
+    image: docker.elastic.co/kibana/kibana:7.11.1
     ports:
       - "5601:5601"
     configs: