Switch to shared CI configuration

inc/class-rewrite-content.php

@@ -36,7 +36,7 @@ class Rewrite_Content {
 	 * @param string $content Post content.
 	 * @return string
 	 */
-	public function filter_the_content( string $content ) : string {
+	public function filter_the_content( string $content ) {
 		// TODO: only deal with image srcs, use DOM Document.
 		return $content;
 	}