Add interface support for dead docblock (#51)

* add interface fixture

* add docblock support for interface removal

Author: TomasVotruba

src/DocBlock/UselessDocBlockCleaner.php

@@ -47,13 +47,13 @@ final class UselessDocBlockCleaner
      * @see https://regex101.com/r/RzTdFH/4
      * @var string
      */
-    private const STANDALONE_COMMENT_CLASS_REGEX = '#\/\/\s+([cC]lass|[tT]rait)\s+\w+$#';
+    private const STANDALONE_COMMENT_CLASS_REGEX = '#\/\/\s+(class|trait|interface)\s+\w+$#i';
 
     /**
      * @see https://regex101.com/r/RzTdFH/4
      * @var string
      */
-    private const INLINE_COMMENT_CLASS_REGEX = '#( \*|\/\/)\s+([cC]lass|[tT]rait)\s+(\w+)\n#';
+    private const INLINE_COMMENT_CLASS_REGEX = '#( \*|\/\/)\s+(class|trait|interface)\s+(\w+)\n#i';
 
     /**
      * @see https://regex101.com/r/bzbxXz/2

tests/Fixer/Commenting/RemoveUselessDefaultCommentFixer/Fixture/interface_docblock.php.inc

@@ -0,0 +1,24 @@
+<?php
+
+namespace Symplify\CodingStandard\Tests\Fixer\Commenting\RemoveUselessDefaultCommentFixer\Fixture;
+
+/**
+ * Interface SomeInterface
+ */
+interface SomeInterface
+{
+}
+
+?>
+-----
+<?php
+
+namespace Symplify\CodingStandard\Tests\Fixer\Commenting\RemoveUselessDefaultCommentFixer\Fixture;
+
+/**
+ */
+interface SomeInterface
+{
+}
+
+?>