chore: prepare for v0.3 breaking changes (#2747)

Bug fixes will be applied to the v0.2.x branch.

tokio-util/Cargo.toml

@@ -7,17 +7,18 @@ name = "tokio-util"
 #   - Cargo.toml
 # - Update CHANGELOG.md.
 # - Create "v0.2.x" git tag.
-version = "0.3.1"
+version = "0.4.0"
 edition = "2018"
 authors = ["Tokio Contributors <[email protected]>"]
 license = "MIT"
 repository = "https://github.com/tokio-rs/tokio"
 homepage = "https://tokio.rs"
-documentation = "https://docs.rs/tokio-util/0.3.1/tokio_util"
+documentation = "https://docs.rs/tokio-util/0.4.0/tokio_util"
 description = """
 Additional utilities for working with Tokio.
 """
 categories = ["asynchronous"]
+publish = false
 
 [features]
 # No features on by default
@@ -31,7 +32,7 @@ codec = ["tokio/stream"]
 udp = ["tokio/udp"]
 
 [dependencies]
-tokio = { version = "0.2.5", path = "../tokio" }
+tokio = { version = "0.3.0", path = "../tokio" }
 
 bytes = "0.5.0"
 futures-core = "0.3.0"
@@ -41,8 +42,8 @@ log = "0.4"
 pin-project-lite = "0.1.4"
 
 [dev-dependencies]
-tokio = { version = "0.2.0", path = "../tokio", features = ["full"] }
-tokio-test = { version = "0.2.0", path = "../tokio-test" }
+tokio = { version = "0.3.0", path = "../tokio", features = ["full"] }
+tokio-test = { version = "0.3.0", path = "../tokio-test" }
 
 futures = "0.3.0"
 

tokio-util/src/lib.rs

@@ -1,4 +1,4 @@
-#![doc(html_root_url = "https://docs.rs/tokio-util/0.3.1")]
+#![doc(html_root_url = "https://docs.rs/tokio-util/0.4.0")]
 #![allow(clippy::needless_doctest_main)]
 #![warn(
     missing_debug_implementations,