Hello, thank you for creating nice app and import tool!
I fixed json_generator.rb to build boostnote.json as same as Boostnote itself by using JSON.pretty_generate, and replace the order of json keys.

before:

{"folders":[{"key":"xxxx","name":"myFolderName","color":"#B013A4"},{"key":"yyyy","name":"myFolderName2","color":"#FF8E00"},(...)],"version":"1.0"}

after:

{
  "folders": [
    {
      "key": "xxxx",
      "color": "#3FD941",
      "name": "myFolderName"
    },
    {
      "key": "yyyy",
      "color": "#2BA5F7",
      "name": "myFolderName2"
    },
    (...)
  ],
  "version": "1.0"
}