$ volt get tyru/caw.vim
[INFO] Full building /Users/Toshiki/.vim/pack/volt/opt directory ...
[INFO] Installing vimrc and gvimrc ...
+ github.com/tyru/caw.vim > installed

$ cat ~/volt/lock.json
{
  "version": 2,
  "current_profile_name": "default",
  "repos": [
    {
      "type": "git",
      "path": "github.com/tyru/caw.vim",
      "version": "98805a60aef339e55e5b917fdb9f69c74e8d8340"
    }
  ],
  "profiles": [
    {
      "name": "default",
      "repos_path": [
        "github.com/tyru/caw.vim"
      ]
    }
  ]
}
$ volt edit tyru/caw.vim
# any edit

$ cat ~/volt/lock.json
{
  "version": 2,
  "current_profile_name": "default",
  "repos": [],
  "profiles": [
    {
      "name": "default",
      "repos_path": []
    }
  ]
}