Update Dockerfile

Dockerfile

@@ -12,7 +12,7 @@ FROM renku/renkulab-py:3.7-renku0.10.4-0.6.3
 USER root
 RUN apt-get update && \
   apt-get install -y --no-install-recommends \
-  apt-utils \
+  apt-utils 
 USER ${NB_USER}
 
 # RUN