fix(php_codesniffer): Ignore config/reference.php (#1981)

* Exclude reference.php from PHP CodeSniffer ruleset

* Apply suggestion from @jrfnl

Co-authored-by: Juliette <663378+jrfnl@users.noreply.github.com>

---------

Co-authored-by: Dmitri Perunov <diimpp@gmail.com>
Co-authored-by: Juliette <663378+jrfnl@users.noreply.github.com>

Author: 3 people

squizlabs/php_codesniffer/3.6/phpcs.xml.dist

@@ -16,4 +16,6 @@
     <file>src/</file>
     <file>tests/</file>
 
+    <exclude-pattern>config/reference\.php$</exclude-pattern>
+
 </ruleset>