Update Dockerfile

(cherry picked from commit 2eb16ab8eb7d54c6ab11817a0f6551738456ab10)

bigbluebutton-html5/Dockerfile.test

@@ -3,6 +3,7 @@ MAINTAINER ffdixon@bigbluebutton.org
 
 ENV DEBIAN_FRONTEND noninteractive
 # RUN echo 'Acquire::http::Proxy "http://192.168.0.130:3142 ";'  > /etc/apt/apt.conf.d/01proxy
+
 RUN apt-get update && apt-get install -y wget software-properties-common
 
 RUN echo "deb http://ubuntu.bigbluebutton.org/xenial-200-dev bigbluebutton-xenial main   " | tee /etc/apt/sources.list.d/bigbluebutton.list