io: export write::*

We weren't exporting WriteExt.
We already do that with read::*

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>

src/io/mod.rs

@@ -285,7 +285,7 @@ cfg_std! {
     pub use repeat::{repeat, Repeat};
     pub use seek::Seek;
     pub use sink::{sink, Sink};
-    pub use write::Write;
+    pub use write::*;
 
     pub mod prelude;