post_install() {
    printf "\e[1;32m ==>\e[0;1m %s\n" \
           "blackeye: IMPORTANT"
    printf "\e[1;34m  ->\e[0;1m %s\n" \
           "Don't forget to save your ngrok token to your local configuration by"
    printf "\e[1;34m  ->\e[0;33m %s\n" \
           "    $ ngrok authtoken <your_token>"
    printf "\e[1;34m  ->\e[0;1m %s\e[0m\n" \
           "if you haven't done so yet."
}