feat!: Remove simple::SimpleProtocol (#3191)

Due to lack of usage, remove the `simple::SimpleProtocol`. Users may look at `libp2p::core::upgrade` for alternatives.
libp2p · Dec 9, 2022 · 4fe518d · 4fe518d
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -47,9 +47,13 @@
 
 # 0.51.0 [unreleased]
 
+- Remove `SimpleProtocol` due to being unused. See [`libp2p::core::upgrade`](https://docs.rs/libp2p/0.50.0/libp2p/core/upgrade/index.html) for alternatives. See [PR 3191].
+
 - Update individual crates.
   - Update to [`libp2p-swarm` `v0.42.0`](swarm/CHANGELOG.md#0420).
 
+[PR 3191]: https://github.com/libp2p/rust-libp2p/pull/3191
+
 # 0.50.0
 
 This is a large release. After > 4 years, rust-libp2p ships with an [(alpha) QUIC

diff --git a/src/lib.rs b/src/lib.rs
@@ -140,7 +140,6 @@ pub use libp2p_yamux as yamux;
 mod transport_ext;
 
 pub mod bandwidth;
-pub mod simple;
 
 #[cfg(doc)]
 pub mod tutorials;
@@ -152,7 +151,6 @@ pub use self::core::{
     PeerId, Transport,
 };
 pub use self::multiaddr::{multiaddr as build_multiaddr, Multiaddr};
-pub use self::simple::SimpleProtocol;
 pub use self::swarm::Swarm;
 pub use self::transport_ext::TransportExt;
 

diff --git a/src/simple.rs b/src/simple.rs