Sync settings after installing the integration

[knrt10]

This is reference to issue #1

Added Functionalities:

When a user has a predefined .github folder and they install the probot/settings app after that, then 2 functionalities are added

1.) If .github folder has settings.yml file then it will be automatically synced.

2.) If no settings.yml file is found in .github then the bot opens a PR with some default settings in settings.yml file.

[ci-reporter]

The build is failing

✨ Good work on this PR so far! ✨ Unfortunately, the Travis CI build is failing as of fc15878. Here's the output:

npm test

> probot-settings@1.0.0 test /home/travis/build/probot/settings
> jest && standard

 PASS  test/lib/plugins/repository.test.js
 PASS  test/lib/plugins/collaborators.test.js
 PASS  test/lib/plugins/labels.test.js
 PASS  test/lib/plugins/teams.test.js
 PASS  test/index.test.js

Test Suites: 5 passed, 5 total
Tests:       9 passed, 9 total
Snapshots:   0 total
Time:        6.036s
Ran all test suites.
standard: Use JavaScript Standard Style (https://standardjs.com)
standard: Run `standard --fix` to automatically fix some problems.
  /home/travis/build/probot/settings/index.js:30:7: Extra space after key 'owner'.
  /home/travis/build/probot/settings/index.js:31:7: Extra space after key 'repo'.
  /home/travis/build/probot/settings/index.js:33:1: Expected indentation of 4 spaces but found 6.

I'm sure you can fix it! If you need help, don't hesitate to ask a maintainer of the project!

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