fix: missing this declartion

Author: frankpagan

src/index.js

@@ -18,7 +18,7 @@ class CoCreateServerSideRender {
                 )) {
                 let meta = el.attributes;
 
-                if (renderedIgnoreEl[el.tagName])
+                if (this.renderedIgnoreEl[el.tagName])
                     continue;
 
                 if (el.tagName == "DIV" && !el.classList.contains('domEditor'))