feat: Update playlist embed URLs to https

Resolves #15 (closed)

src/main/java/org/eclipsefoundation/media/models/PlayerInfo.java

@@ -25,6 +25,8 @@ public abstract class PlayerInfo {
 
     public abstract String getEmbedHtml();
 
+    public abstract Builder toBuilder();
+
     public static Builder builder() {
         return new AutoValue_PlayerInfo.Builder();
     }