Update upgradeRelTagToCategory() to avoid adding elements to parsed e-*

Fixed test to include the original rel=tag HTML/text

Author: gRegorLove

Mf2/Parser.php

@@ -1340,8 +1340,8 @@ public function upgradeRelTagToCategory(DOMElement $el) {
 				$dataEl->setAttribute('class', 'category');
 				$dataEl->setAttribute('value', $value);
 
-				# append before the current element
-				$tempEl->parentNode->insertBefore($dataEl, $tempEl);
+				# append as child of input element. this should ensure added element does get parsed inside e-*
+				$el->appendChild($dataEl);
 			}
 		}
 	}

tests/Mf2/ClassicMicroformatsTest.php

@@ -892,8 +892,7 @@ public function testHEntryRelTagInContent() {
     $input = <<< END
 <article class="hentry">
   <div class="entry-content">
-    Entry content should not include the generated <code>data</code> element for rel tag backcompat
-    <a href="/tag/test" rel="tag">test</a>
+    Entry content should not include the generated <code>data</code> element for rel tag backcompat <a href="/tag/test" rel="tag">test</a>
   </div>
 </article>
 END;
@@ -903,8 +902,8 @@ public function testHEntryRelTagInContent() {
     $item = $output['items'][0];
 
     $this->assertEquals(['test'], $item['properties']['category']);
-    $this->assertEquals('Entry content should not include the generated data element for rel tag backcompat', $item['properties']['content'][0]['value']);
-    $this->assertEquals('Entry content should not include the generated <code>data</code> element for rel tag backcompat', $item['properties']['content'][0]['html']);
+    $this->assertEquals('Entry content should not include the generated data element for rel tag backcompat test', $item['properties']['content'][0]['value']);
+    $this->assertEquals('Entry content should not include the generated <code>data</code> element for rel tag backcompat <a href="/tag/test" rel="tag">test</a>', $item['properties']['content'][0]['html']);
   }
 
 	/**