feat(#423): highlight lines test case

Author: peterpeterparker

webcomponents/highlight-code/src/index.html

@@ -131,7 +131,7 @@ <h1>Without line numbers</h1>
 </deckgo-highlight-code>
 
 <h1>Issue #423</h1>
-<deckgo-highlight-code language="java" highlight-lines="6,7">
+<deckgo-highlight-code language="java" highlight-lines="6,7 13,14">
   <code slot="code"># main.tf
 
     resource "aws_lambda_function" "api" {