message: Update docker script's mono version.
diff: @@ -12,7 +12,7 @@ FROM beamdog/nwserver
  RUN mkdir /nwn/nwnx
  COPY --from=builder /nwnx/home/Binaries/* /nwn/nwnx/
  # Install mono
  -ENV MONO_VERSION 5.16.0.179
  +ENV MONO_VERSION 5.16.0.220
  ENV APT_KEY_DONT_WARN_ON_DANGEROUS_USAGE=1
  RUN apt-get update \
  && apt-get -y install gnupg2 \
  