Add the docker version in the ReadMe.md file.
@@ -17,6 +17,7 @@ We invite everyone to help us improve and keep documentation up to date. Documen
* [Java 8](https://openjdk.java.net/install)+
* [PostgreSQL 9.6](https://www.postgresql.org/download)
* [Gradle 4.10](https://gradle.org/releases)+ (_optional_)
+* [Docker 17.05](https://docs.docker.com/develop/develop-images/multistage-build/)+ (_optional_)
## Building
