update blog link, points to correct url

+ blog link pointed to generic url, not specific article

demo/whats-new.md

@@ -9,6 +9,6 @@ keywords: example demo custom common standard normal typical
 
 ## Live example
 
-In this example we highlight new features in the 4.3 release, including the image caption option, media embeds and code snippets. For more information on the 4.3 release please see our [blog post](http://blog.tinymce.com/).
+In this example we highlight new features in the 4.3 release, including the image caption option, media embeds and code snippets. For more information on the 4.3 release please see our [blog post](https://www.ephox.com/blog/tinymce-4-3-brings-a-new-site-live-media-embedding-table-editing-features-and-apis/).
 
 {% include codepen.html id="Madpwx" height="900" %}