Further PHP 7.3 updates

Update for class namespace to resolve PHP 7.3 compatibility

src/Analysis/Analysis.php

@@ -153,7 +153,7 @@ public function getResult()
     }
 
     /**
-     * @return \simplehtmldom_1_5\simple_html_dom
+     * @return \simple_html_dom\simple_html_dom
      */
     public function getRenderedHtmlDomParser()
     {

src/Extensions/PageHealthExtension.php

@@ -70,7 +70,7 @@ public function getRenderedHtml()
     /**
      * Gets the DOM parser for the rendered html
      *
-     * @return \simplehtmldom_1_5\simple_html_dom
+     * @return \simple_html_dom\simple_html_dom
      */
     public function getRenderedHtmlDomParser()
     {

src/Forms/GoogleSearchPreview.php

@@ -8,7 +8,7 @@
 use SilverStripe\View\ArrayData;
 use SilverStripe\View\Parsers\URLSegmentFilter;
 use SilverStripe\View\Requirements;
-use simplehtmldom_1_5\simple_html_dom;
+use simple_html_dom\simple_html_dom;
 use Vulcan\Seo\Extensions\PageHealthExtension;
 use Vulcan\Seo\Extensions\PageSeoExtension;