generate json pretty

[narukami894]

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"
}

[asmsuechan]

Hi, @narukami894. Sorry for my long absence and thank you very much for your improvement!
LGTM

[asmsuechan]

GOSH. I don't have merge authorization...

[asmsuechan]

Excuse me, @Rokt33r. Will you please merge opening 2 PRs and remove this line

ever2boost/.travis.yml

Line 7 in 17be2a8

- 2.0.0

?

The reason why I tried to support even Ruby2.0 is that because it's pre-installed version of Ruby on macOS. So I'd say it's not good to remove compatibility with it.

[Rokt33r]

@asmsuechan I've invited you as an admin to this repository. Check your e-mail. 😄

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