macros: Remove use requirement on minidom::IntoAttributeValue.

src/roster.rs

@@ -4,7 +4,7 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this
 // file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-use minidom::{Element, IntoAttributeValue};
+use minidom::Element;
 use jid::Jid;
 
 use error::Error;