When space is set identation does not work correctly for nested objects and arrays in stringifyAsync.

[ErgerSusha]

If you set space parameter and call stringifyAsync nested object and arrays are not indented properly. Here is a test suite, that confirms such behavior:

'use strict';

const yj = require('../index');
const tap = require('tap');

const obj = {
  name: 'Jacqueline Poole',
  gender: 'female',
  age: {
    value: 40
  },
  agesArray: [
    10,
    20,
    30
  ]
};

yj.stringifyAsync(obj, null, '  ', (err, str) => {
  if (!err)
    tap.equal(str, '{\n  "name": "Jacqueline Poole",\n  "gender": "female",\n  "age": ' +
      '{\n    "value": 40\n  },\n  "agesArray": [\n    10,\n    20,\n    30\n  ]\n}');
  else
    tap.fail(err);
});

Output:

not ok 1 - should be equal
  ---
  found: |-
    {
      "name": "Jacqueline Poole",
      "gender": "female",
      "age": {
      "value": 40
    },
      "agesArray": [
      10,
      20,
      30
    ]
    }
  wanted: |-
    {
      "name": "Jacqueline Poole",
      "gender": "female",
      "age": {
        "value": 40
      },
      "agesArray": [
        10,
        20,
        30
      ]
    }

[gireeshpunathil]

thanks @ErgerSusha for reporting this bug. I will look into it; and meanwhile feel free to come up with a PR, if you have ideas on how to fix it!