Update Julia Nightly (For docker)

update_julia.sh

#!/bin/bash
# inspired from travis CI julia support
# https://github.com/travis-ci/travis-build/blob/1b50ac7aeff53e2fed4c629920ebbb4814e71ea8/lib/travis/build/script/julia.rb
echo 'Installing Julia'
CURL_USER_AGENT="Travis-CI $(curl --version | head -n 1)"
JULIA_URL="https://julialangnightlies-s3.julialang.org/bin/linux/x64/julia-latest-linux64.tar.gz"

mkdir -p ~/julia
curl -A "$CURL_USER_AGENT" -k -s -L --retry 7 $JULIA_URL | tar -C ~/julia -x -z --strip-components=1 -f -

ln -sf  ~/julia/bin/julia ~/bin/julia

julia -e 'versioninfo()'
echo ' '