Add link to iana.org

Author: antonmedv

spec/v0.1.md

@@ -326,8 +326,8 @@ MAML files should use the extension `.maml`.
 MIME Type
 ---------
 
-When transferring MAML files over the internet, the appropriate MIME type is
-`application/maml`.
+When transferring MAML files, the appropriate MIME type is 
+[`application/vnd.maml`](https://www.iana.org/assignments/media-types/application/vnd.maml).
 
 
 ABNF Grammar