Downloaders should be predefined inside the distribution package

[activatedgeek]

As shown in the README, in put-cli.json

{
  "downloader": "wget -O $1/$2 \"$3\""
}

OR

{
  "downloader": "aria2c -x 4 -s 4 -c -d $1 -o $2 \"$3\""
}

these downloaders should be inside the source code, and all the user should write is wget or aria2. We choose the best set of options to use from wget and aria2 predefined in the CLI.