Updated Add a Custom Service (markdown)

Add-a-Custom-Service.md

@@ -18,3 +18,5 @@ function updateBadge(e) {
 var originalTitle = document.title;
 setInterval(checkUnread, 3000);
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+Once you finish writing and testing your code, it will be a great practice to minify it before pasting it into the Dialog Box into Rambox. To minify it, you can use [JSCompress](http://jscompress.com/).