Add deprecation notice to README

Merge branch 'develop'

Update nginx from 1.14.2 to 1.16.1 and nginx-clojure from 0.5.1 to 0.5.2

Merge pull request #5 from Yleisradio/fix/alb-keep-idle-timeout-work-together

FIX: keep alive idle timeout on ALB and NGINX does not work together

Run yum update

Trigger rebuild

Merge pull request #4 from Yleisradio/feature/update-versions-2

Switch the base image to Amazon Corretto

Build from develop

Upgrade Leiningen to 2.9.3

Upgrade nginx to 1.14.2, nginx-clojure to 0.5.1

Fix docker image tags [ci skip]

Build and run on Alpine to decrease image size

Fix whitespace