Improve quickcheck impl for Duration

Author: jhpratt

time/src/quickcheck.rs

@@ -77,9 +77,9 @@ impl Arbitrary for Duration {
 
     fn shrink(&self) -> Box<dyn Iterator<Item = Self>> {
         Box::new(
-            (self.subsec_nanoseconds_ranged(), self.whole_seconds())
+            (self.whole_seconds(), self.subsec_nanoseconds_ranged())
                 .shrink()
-                .map(|(mut nanoseconds, seconds)| {
+                .map(|(seconds, mut nanoseconds)| {
                     // Coerce the sign if necessary.
                     if (seconds > 0 && nanoseconds.get() < 0)
                         || (seconds < 0 && nanoseconds.get() > 0)