core/: Introduce rsa feature flag to avoid ring dependency (libp2…

…p#2860)

- Introduce `rsa` feature flag to `libp2p-core`.
- Expose `rsa` feature in `libp2p`.
- Add `rsa` feature to `libp2p` `default`.

CHANGELOG.md

@@ -4,6 +4,8 @@
 
 - Update to `libp2p-request-response` `v0.21.0`.
 
+- Update to `libp2p-core` `v0.36.0`.
+
 # 0.6.0
 
 - Update prost requirement from 0.10 to 0.11 which no longer installs the protoc Protobuf compiler.

Cargo.toml

@@ -18,7 +18,7 @@ async-trait = "0.1"
 futures = "0.3"
 futures-timer = "3.0"
 instant = "0.1"
-libp2p-core = { version = "0.35.0", path = "../../core", default-features = false }
+libp2p-core = { version = "0.36.0", path = "../../core", default-features = false }
 libp2p-swarm = { version = "0.39.0", path = "../../swarm" }
 libp2p-request-response = { version = "0.21.0", path = "../request-response" }
 log = "0.4"