Reexport ElementWriter, because it is used in public API but its name was not accessible to users

That API was introduced in 7c9ba88 in tafia/quick-xml#274

Author: Mingun

Changelog.md

@@ -19,6 +19,8 @@
   from the attribute and element names and attribute values
 - fix: allow to deserialize `unit`s from text and CDATA content.
   `DeError::InvalidUnit` variant is removed, because after fix it is no longer used
+- fix: `ElementWriter`, introduced in [#274](https://github.com/tafia/quick-xml/pull/274)
+  (0.23.0-alpha2) now available to end users
 
 ## 0.23.0-alpha3
 

src/lib.rs

@@ -151,4 +151,5 @@ mod writer;
 #[cfg(feature = "serialize")]
 pub use crate::errors::serialize::DeError;
 pub use crate::errors::{Error, Result};
-pub use crate::{reader::Reader, writer::Writer};
+pub use crate::reader::Reader;
+pub use crate::writer::{ElementWriter, Writer};

src/writer.rs

@@ -220,6 +220,8 @@ impl<W: Write> Writer<W> {
     }
 }
 
+/// A struct to write an element. Contains methods to add attributes and inner
+/// elements to the element
 pub struct ElementWriter<'a, W: Write> {
     writer: &'a mut Writer<W>,
     start_tag: BytesStart<'a>,