Tests fail on unchanged clone

[worthlutz]

Steps to reproduce:

1. clone the repository
2. run npm install
3. run npm run test

Tests fail in eslint.

> react-checkbox-tree@1.2.3 test /home/worth/projects/test/react-checkbox-tree
> gulp test

[10:28:31] Using gulpfile ~/projects/test/react-checkbox-tree/gulpfile.js
[10:28:31] Starting 'test-script-format'...
[10:28:34] 'test-script-format' errored after 3.09 s
[10:28:34] ESLintError in plugin "gulp-eslint"
Message:
    Form label must have ALL of the following types of associated control: nesting, id
Details:
    fileName: /home/worth/projects/test/react-checkbox-tree/src/js/TreeNode.js
    lineNumber: 201

[10:28:35] 
/home/worth/projects/test/react-checkbox-tree/src/js/TreeNode.js
  201:13  error  Form label must have ALL of the following types of associated control: nesting, id  jsx-a11y/label-has-for

✖ 1 problem (1 error, 0 warnings)

npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! react-checkbox-tree@1.2.3 test: `gulp test`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the react-checkbox-tree@1.2.3 test script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /home/worth/.npm/_logs/2018-07-06T14_28_35_395Z-debug.log

[adamchenwei]

hum... this is not merged into the main repo... maybe should close it after its change accepted? @jakezatecky ? or this is hack not a fix? but better than leave it lol