style(phpcs): Switch to PSR-12

https://www.php-fig.org/psr/psr-12/

composer.lock

@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "33493e464172695368aaecf1f8e4e563",
+    "content-hash": "07b922cb69b4f4dbd5e537656d559c8d",
     "packages": [
         {
             "name": "aura/session",
@@ -3831,16 +3831,16 @@
         },
         {
             "name": "squizlabs/php_codesniffer",
-            "version": "3.4.2",
+            "version": "3.5.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/squizlabs/PHP_CodeSniffer.git",
-                "reference": "b8a7362af1cc1aadb5bd36c3defc4dda2cf5f0a8"
+                "reference": "0afebf16a2e7f1e434920fa976253576151effe9"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/squizlabs/PHP_CodeSniffer/zipball/b8a7362af1cc1aadb5bd36c3defc4dda2cf5f0a8",
-                "reference": "b8a7362af1cc1aadb5bd36c3defc4dda2cf5f0a8",
+                "url": "https://api.github.com/repos/squizlabs/PHP_CodeSniffer/zipball/0afebf16a2e7f1e434920fa976253576151effe9",
+                "reference": "0afebf16a2e7f1e434920fa976253576151effe9",
                 "shasum": ""
             },
             "require": {
@@ -3878,7 +3878,7 @@
                 "phpcs",
                 "standards"
             ],
-            "time": "2019-04-10T23:49:02+00:00"
+            "time": "2019-09-26T23:12:26+00:00"
         },
         {
             "name": "symfony/console",