minor updates

MarkdownLivePreview.tasks

@@ -10,6 +10,7 @@ Medium:
   ☐ use alt attribute for 404 error
   ☐ use MarkdownLivePreview syntax, so we can use syntax's settings
   ☐ listen for settings to change
+  ☐ fix relative source
 
 Long:
   ☐ fix #4 @high