Typo in documentation example

[oleg-koval]

Returns:

Invalid config file: Unexpected token } in JSON at position 210

for

{
  "threshold": 30,
  "identifiers": true,
  "literals": true,
  "color": true,
  "minInstances": 2,
  "ignore": "test|spec|mock",
  "reporter": "json",
  "truncate": 100,
}

should be:

{
  "threshold": 30,
  "identifiers": true,
  "literals": true,
  "color": true,
  "minInstances": 2,
  "ignore": "test|spec|mock",
  "reporter": "json",
  "truncate": 100
}