Allow return type resource

Author: s.poniecki

custom-standards/Flyeralarm/Sniffs/Docblock/ReturnTypeSniff.php

@@ -15,6 +15,7 @@ class ReturnTypeSniff implements Sniff
         'int',
         'string',
         'float',
+        'resource',
         'array',
         'bool[]',
         'int[]',

tests/rules/doc/allowed/ReturnTypeResource.php

@@ -0,0 +1,16 @@
+<?php
+
+// @expectedPass
+
+namespace flyeralarm\Test;
+
+class FooTest
+{
+
+    /**
+     * @return resource
+     */
+    public function testBar()
+    {
+    }
+}