chore: prepare Tokio v1.31.0 release (#5928)

Author: carllerche

README.md

@@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml:
 
 ```toml
 [dependencies]
-tokio = { version = "1.30.0", features = ["full"] }
+tokio = { version = "1.31.0", features = ["full"] }
 ```
 Then, on your main.rs:
 

tokio/CHANGELOG.md

@@ -1,3 +1,18 @@
+# 1.31.0 (August 10, 2023)
+
+### Fixed
+
+* io: delegate `WriteHalf::poll_write_vectored` ([#5914])
+
+### Unstable
+
+* rt(unstable): fix memory leak in unstable next-gen scheduler prototype ([#5911])
+* rt: expose mean task poll time metric ([#5927])
+
+[#5914]: https://github.com/tokio-rs/tokio/pull/5914
+[#5911]: https://github.com/tokio-rs/tokio/pull/5911
+[#5927]: https://github.com/tokio-rs/tokio/pull/5927
+
 # 1.30.0 (August 9, 2023)
 
 This release bumps the MSRV of Tokio to 1.63. ([#5887])

tokio/Cargo.toml

@@ -6,7 +6,7 @@ name = "tokio"
 #   - README.md
 # - Update CHANGELOG.md.
 # - Create "v1.x.y" git tag.
-version = "1.30.0"
+version = "1.31.0"
 edition = "2021"
 rust-version = "1.63"
 authors = ["Tokio Contributors <[email protected]>"]

tokio/README.md

@@ -56,7 +56,7 @@ Make sure you activated the full features of the tokio crate on Cargo.toml:
 
 ```toml
 [dependencies]
-tokio = { version = "1.30.0", features = ["full"] }
+tokio = { version = "1.31.0", features = ["full"] }
 ```
 Then, on your main.rs: