Add <a> to inline content set

Fixes issue #31

Author: xemlock

library/HTMLPurifier/HTML5Config.php

@@ -2,7 +2,7 @@
 
 class HTMLPurifier_HTML5Config extends HTMLPurifier_Config
 {
-    const REVISION = 2019041501;
+    const REVISION = 2019042601;
 
     /**
      * @param  string|array|HTMLPurifier_Config $config

library/HTMLPurifier/HTMLModule/HTML5/Hypertext.php

@@ -25,6 +25,7 @@ public function setup($config)
             'target'   => new HTMLPurifier_AttrDef_HTML_FrameTarget(),
             'type'     => 'Text',
         ));
+        $this->addElementToContentSet('a', 'Inline');
         $a->excludes = array('a' => true);
     }
 }

tests/HTMLPurifier/HTMLModule/HTML5/HypertextTest.php

@@ -23,6 +23,13 @@ public function anchorInput()
             array(
                 '<a href="foo" download="bar">Download</a>',
             ),
+            array(
+                '<p>Foo <a href="foo">foo</a> bar</p>'
+            ),
+            array(
+                '<a href="foo"><p>Foo <a href="foo">foo</a></p></a>',
+                '<a href="foo"><p>Foo </p></a>',
+            ),
         );
     }