add enclosure element

inc/teddit_api/handleSubreddit.js

@@ -50,6 +50,13 @@ module.exports = function() {
               
         if(is_self_link)
           link.url = link.permalink
+          
+        let thumb_mime = ''
+        let ext = thumbnail.split('.').pop()
+        if(ext === 'png')
+          thumb_mime = 'image/png'
+        else
+          thumb_mime = 'image/jpeg'
         
         let append_desc_html = `<br/><a href="${link.url}">[link]</a> <a href="${link.permalink}">[comments]</a>`
         
@@ -61,6 +68,7 @@ module.exports = function() {
             <domain>${link.domain}</domain>
             <id>${link.id}</id>
             <thumbnail>${thumbnail}</thumbnail>
+            <enclosure length="0" type="${thumb_mime}" url="${thumbnail}" />
             <link>${link.permalink}</link>
             <url>${link.url}</url>
             <description><![CDATA[${unescape(link.selftext_html)}${append_desc_html}]]></description>