Merge pull request #43 from tbouron/fix/dockerfile-2

Fix docker build by reverting to docker image maven:3.5.4-jdk-8

Dockerfile

@@ -17,7 +17,7 @@
 
 # For all Brooklyn, we use a debian distribution instead of alpine as there are some libgcc incompatibilities with GO
 # and PhantomJS
-FROM maven:3.6.3-jdk-8
+FROM maven:3.5.4-jdk-8
 
 # Install the non-headless JRE as some tests requires them
 RUN apt-get update && apt-get install -y openjdk-8-jre