Fix silly typo

docker/Dockerfile

@@ -7,7 +7,7 @@ MAINTAINER Theodotos Andreou theodotos.andreou@puri.sm
 
 RUN apt-get update && \
     apt-get -q -y dist-upgrade && \
-    apt-get install -q -y --no-install-recommends && \
+    apt-get install -q -y --no-install-recommends \
     software-properties-common \
     python-software-properties \
     python-pip python-dev \