Address some clippy comments.

Add docs for `Config`.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/ser/mod.rs b/src/ser/mod.rs
index 26845b3..8b3e41c 100644
--- a/src/ser/mod.rs
+++ b/src/ser/mod.rs
@@ -460,8 +460,8 @@ impl<'output, Target> ser::SerializeMap for MapSerializer<'output, Target>
                                                    value: &T)
                                                    -> Result<(), Error> {
         {
-            let key = self.key.as_ref().ok_or_else(|| Error::no_key())?;
-            let value_sink = value::ValueSink::new(self.urlencoder, &key);
+            let key = self.key.as_ref().ok_or_else(Error::no_key)?;
+            let value_sink = value::ValueSink::new(self.urlencoder, key);
             value.serialize(part::PartSerializer::new(value_sink))?;
         }
         self.key = None;