try to fix unbound

Signed-off-by: Christian Richter <crichter@owncloud.com>

unbound/Dockerfile

@@ -2,7 +2,7 @@ FROM debian:latest
 LABEL maintainer="dragonchaser <autobuilds@datenschmutz.space>"
 EXPOSE 5335/udp
 RUN apt-get update \
-  && apt-get -y install unbound netcat-traditional
+  && apt-get -y install unbound netcat
 COPY unbound/config.conf /etc/unbound/unbound.conf.d/
 COPY unbound/entrypoint.sh /
 ENTRYPOINT /entrypoint.sh