swarm/behaviour: make either mod private (#2610)

With no public items, having this module public serves no purpose.

Author: elenaf9

swarm/CHANGELOG.md

@@ -4,7 +4,10 @@
 
 - Update to `libp2p-core` `v0.33.0`.
 
+- Make `behaviour::either` module private. See [PR 2610]
+
 [PR 2529]: https://github.com/libp2p/rust-libp2p/pull/2529
+[PR 2610]: https://github.com/libp2p/rust-libp2p/pull/2610/
 
 # 0.35.0
 

swarm/src/behaviour.rs

@@ -18,7 +18,7 @@
 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 // DEALINGS IN THE SOFTWARE.
 
-pub mod either;
+mod either;
 pub mod toggle;
 
 use crate::dial_opts::DialOpts;