Prepare release v3.0.0 (#209)

## heroku/procfile

### Added

- Enabled tracing/telemetry via `libcnb`'s `trace` feature. ([#208](#208))

### Changed

- Updated to Buildpack API 0.10. ([#205](#205))
    - All launch processes are now wrapped in `bash -c` instead of using CNB's `direct = false` directive, which is no longer available.
    - `.profile` and `.profile.d` scripts will no longer be automatically sourced.
    - CNB Lifecycle 0.17 or newer is now required.

Co-authored-by: heroku-linguist[bot] <136119646+heroku-linguist[bot]@users.noreply.github.com>

Author: heroku-linguist[bot]

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [3.0.0] - 2024-02-23
+
 ### Added
 
 - Enabled tracing/telemetry via `libcnb`'s `trace` feature. ([#208](https://github.com/heroku/procfile-cnb/pull/208))
@@ -66,7 +68,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Initial release of Rust procfile buildpack, the old Go buildpack is now archived.
 - Re-write logic of Procfile parsing to match Heroku's behavior, which has different behavior from the Go version (that assumed that a Procfile was YAML syntax).
 
-[unreleased]: https://github.com/heroku/procfile-cnb/compare/v2.0.2...HEAD
+[unreleased]: https://github.com/heroku/procfile-cnb/compare/v3.0.0...HEAD
+[3.0.0]: https://github.com/heroku/procfile-cnb/compare/v2.0.2...v3.0.0
 [2.0.2]: https://github.com/heroku/procfile-cnb/compare/v2.0.1...v2.0.2
 [2.0.1]: https://github.com/heroku/procfile-cnb/compare/v2.0.0...v2.0.1
 [2.0.0]: https://github.com/heroku/procfile-cnb/compare/v1.0.2...v2.0.0

buildpack.toml

@@ -2,7 +2,7 @@ api = "0.10"
 
 [buildpack]
 id = "heroku/procfile"
-version = "2.0.2"
+version = "3.0.0"
 name = "Heroku Procfile"
 homepage = "https://github.com/heroku/procfile-cnb"
 description = "Heroku's Procfile buildpack."