chore: prepare to release tower v0.4.12 (#642)

* chore: prepare to release v0.4.12

# 0.4.12 (February 16, 2022)

### Fixed

- **hedge**, **load**, **retry**: Fix use of `Instant` operations that
  can panic on platforms where `Instant` is not monotonic ([#633])
- Disable `attributes` feature on `tracing` dependency ([#623])
- Remove unused dependencies and dependency features with some feature
  combinations ([#603], [#602])
- **docs**: Fix a typo in the RustDoc for `Buffer` ([#622])

### Changed

- Updated minimum supported Rust version (MSRV) to 1.49.0.
- **hedge**: Updated `hdrhistogram` dependency to v7.0 ([#602])
- Updated `tokio-util` dependency to v0.7 ([#638])

[#633]: #633
[#623]: #623
[#603]: #603
[#602]: #602
[#622]: #622
[#638]: #638

* add msrv

tower/CHANGELOG.md

@@ -9,6 +9,30 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - None.
 
+# 0.4.12 (February 16, 2022)
+
+### Fixed
+
+- **hedge**, **load**, **retry**: Fix use of `Instant` operations that can panic
+  on platforms where `Instant` is not monotonic ([#633])
+- Disable `attributes` feature on `tracing` dependency ([#623])
+- Remove unused dependencies and dependency features with some feature
+  combinations ([#603], [#602])
+- **docs**: Fix a typo in the RustDoc for `Buffer` ([#622])
+
+### Changed
+
+- Updated minimum supported Rust version (MSRV) to 1.49.0.
+- **hedge**: Updated `hdrhistogram` dependency to v7.0 ([#602])
+- Updated `tokio-util` dependency to v0.7 ([#638])
+
+[#633]: https://github.com/tower-rs/tower/pull/633
+[#623]: https://github.com/tower-rs/tower/pull/623
+[#603]: https://github.com/tower-rs/tower/pull/603
+[#602]: https://github.com/tower-rs/tower/pull/602
+[#622]: https://github.com/tower-rs/tower/pull/622
+[#638]: https://github.com/tower-rs/tower/pull/638
+
 # 0.4.11 (November 18, 2021)
 
 ### Added

tower/Cargo.toml

@@ -6,13 +6,13 @@ name = "tower"
 #   - README.md
 # - Update CHANGELOG.md.
 # - Create "vX.X.X" git tag.
-version = "0.4.11"
+version = "0.4.12"
 authors = ["Tower Maintainers <team@tower-rs.com>"]
 license = "MIT"
 readme = "README.md"
 repository = "https://github.com/tower-rs/tower"
 homepage = "https://github.com/tower-rs/tower"
-documentation = "https://docs.rs/tower/0.4.11"
+documentation = "https://docs.rs/tower/0.4.12"
 description = """
 Tower is a library of modular and reusable components for building robust
 clients and servers.