dnslink-ipfs: contentType guessing bugfix

plugins/dnslink-ipfs/index.js

@@ -103,7 +103,7 @@
             * TODO: this needs a fix
             */
             var contentType = '';
-            switch (dnslinkAddr.split('.', -1)[1].toLowerCase()) {
+            switch (dnslinkAddr.split('.').pop().toLowerCase()) {
                 case 'html':
                 case 'htm':
                     contentType = 'text/html';