Move code style from PSR-2 +custom to PER

[codecov[bot]]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage :thumbsup:

Coverage data is based on head (a1b90f1) compared to base (77b90c0). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## v0.x #21 +/- ## =========================================== Coverage 100.00% 100.00% Complexity 86 86 =========================================== Files 9 9 Lines 264 264 =========================================== Hits 264 264 ``` | [Impacted Files](https://codecov.io/gh/youthweb/php-youthweb-api/pull/21?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=youthweb) | Coverage Δ | | |---|---|---| | [src/Resource/ClientTrait.php](https://codecov.io/gh/youthweb/php-youthweb-api/pull/21?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=youthweb#diff-c3JjL1Jlc291cmNlL0NsaWVudFRyYWl0LnBocA==) | `100.00% <ø> (ø)` | | | [src/Client.php](https://codecov.io/gh/youthweb/php-youthweb-api/pull/21?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=youthweb#diff-c3JjL0NsaWVudC5waHA=) | `100.00% <100.00%> (ø)` | | | [src/JsonObject.php](https://codecov.io/gh/youthweb/php-youthweb-api/pull/21?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=youthweb#diff-c3JjL0pzb25PYmplY3QucGhw) | `100.00% <100.00%> (ø)` | | | [src/RequestFactory.php](https://codecov.io/gh/youthweb/php-youthweb-api/pull/21?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=youthweb#diff-c3JjL1JlcXVlc3RGYWN0b3J5LnBocA==) | `100.00% <100.00%> (ø)` | | | [src/Resource/Posts.php](https://codecov.io/gh/youthweb/php-youthweb-api/pull/21?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=youthweb#diff-c3JjL1Jlc291cmNlL1Bvc3RzLnBocA==) | `100.00% <100.00%> (ø)` | | | [src/Resource/Stats.php](https://codecov.io/gh/youthweb/php-youthweb-api/pull/21?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=youthweb#diff-c3JjL1Jlc291cmNlL1N0YXRzLnBocA==) | `100.00% <100.00%> (ø)` | | | [src/Resource/Users.php](https://codecov.io/gh/youthweb/php-youthweb-api/pull/21?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=youthweb#diff-c3JjL1Jlc291cmNlL1VzZXJzLnBocA==) | `100.00% <100.00%> (ø)` | | | [src/ResourceFactory.php](https://codecov.io/gh/youthweb/php-youthweb-api/pull/21?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=youthweb#diff-c3JjL1Jlc291cmNlRmFjdG9yeS5waHA=) | `100.00% <100.00%> (ø)` | | | [src/YouthwebAuthenticator.php](https://codecov.io/gh/youthweb/php-youthweb-api/pull/21?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=youthweb#diff-c3JjL1lvdXRod2ViQXV0aGVudGljYXRvci5waHA=) | `100.00% <100.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=youthweb). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=youthweb)

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