Upgrade metrics crate to 0.21 version (#5, #6)

- upgrade `metrics-util` crate to 0.15 version

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Kai Ren <tyranron@gmail.com>

Author: dependabot[bot]

CHANGELOG.md

@@ -6,6 +6,22 @@ All user visible changes to this project will be documented in this file. This p
 
 
 
+## [0.4.0] · 2023-04-17
+[0.4.0]: /../../tree/v0.4.0
+
+[Diff](/../../compare/v0.3.1...v0.4.0)
+
+### BC Breaks
+
+- Upgraded to 0.21 version of `metrics` crate. ([#5])
+- Upgraded to 0.15 version of `metrics-util` crate. ([#5], [#6])
+
+[#5]: /../../pull/5
+[#6]: /../../pull/6
+
+
+
+
 ## [0.3.1] · 2023-01-24
 [0.3.1]: /../../tree/v0.3.1
 
@@ -15,7 +31,7 @@ All user visible changes to this project will be documented in this file. This p
 
 - `build()`, `build_freezable()` and `build_frozen()` methods to `recorder::Builder`, allowing to build the resulting `metrics::Recorder` without installing it as `metrics::recorder()`. ([#4])
 
-[#3]: /../../pull/4
+[#4]: /../../pull/4
 
 
 

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "metrics-prometheus"
-version = "0.3.1"
+version = "0.4.0"
 edition = "2021"
 rust-version = "1.65"
 description = "`prometheus` backend for `metrics` crate."
@@ -16,8 +16,8 @@ include = ["/src/", "/CHANGELOG.md", "/LICENSE.md", "/README.md"]
 
 [dependencies]
 arc-swap = "1.5"
-metrics = { version = "0.20", default-features = false }
-metrics-util = { version = "0.14", features = ["registry"], default-features = false }
+metrics = { version = "0.21", default-features = false }
+metrics-util = { version = "0.15", features = ["registry"], default-features = false }
 once_cell = "1.16"
 prometheus = { version = "0.13", default-features = false }
 sealed = "0.4"
@@ -28,4 +28,4 @@ smallvec = "1.10"
 thiserror = "1.0.2"
 
 [dev-dependencies]
-metrics-util = { version = "0.14", features = ["layer-filter"], default-features = false }
+metrics-util = { version = "0.15", features = ["layer-filter"], default-features = false }