macros: Remove use requirement on try_from::TryFrom.

src/receipts.rs

@@ -4,8 +4,6 @@
 // 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 try_from::TryFrom;
-
 use minidom::Element;
 
 use error::Error;
@@ -21,6 +19,7 @@ generate_element_with_only_attributes!(Received, "received", ns::RECEIPTS, [
 #[cfg(test)]
 mod tests {
     use super::*;
+    use try_from::TryFrom;
 
     #[test]
     fn test_simple() {