docs: Update minimal Rust version (#338)

In #318, the CI version was changed to Rust 1.58+ and installation of
tokio-console 0.1.4 on Rust 1.56-1.57 fails on that version as noted in
`ci.yaml` changes in commit 83d8a87.

Author: shanesveller

console-api/Cargo.toml

@@ -3,7 +3,7 @@ name = "console-api"
 version = "0.2.0"
 license = "MIT"
 edition = "2021"
-rust-version = "1.56.0"
+rust-version = "1.58.0"
 authors = ["Eliza Weisman <[email protected]>", "Tokio Contributors <[email protected]>",]
 readme = "README.md"
 repository = "https://github.com/tokio-rs/console/"

console-api/README.md

@@ -96,7 +96,7 @@ console project.
 ## Supported Rust Versions
 
 The Tokio console is built against the latest stable release. The minimum
-supported version is 1.56. The current Tokio console version is not guaranteed
+supported version is 1.58. The current Tokio console version is not guaranteed
 to build on Rust versions earlier than the minimum supported version.
 
 ## License

console-subscriber/Cargo.toml

@@ -3,7 +3,7 @@ name = "console-subscriber"
 version = "0.1.4"
 license = "MIT"
 edition = "2021"
-rust-version = "1.56.0"
+rust-version = "1.58.0"
 authors = ["Eliza Weisman <[email protected]>", "Tokio Contributors <[email protected]>",]
 readme = "README.md"
 repository = "https://github.com/tokio-rs/console/"

console-subscriber/README.md

@@ -235,7 +235,7 @@ console project.
 ## Supported Rust Versions
 
 The Tokio console is built against the latest stable release. The minimum
-supported version is 1.56. The current Tokio console version is not guaranteed
+supported version is 1.58. The current Tokio console version is not guaranteed
 to build on Rust versions earlier than the minimum supported version.
 
 ## License

tokio-console/Cargo.toml

@@ -4,7 +4,7 @@ version = "0.1.4"
 license = "MIT"
 repository = "https://github.com/tokio-rs/console"
 edition = "2021"
-rust-version = "1.56.0"
+rust-version = "1.58.0"
 authors = ["Eliza Weisman <[email protected]>", "Tokio Contributors <[email protected]>",]
 readme = "README.md"
 homepage = "https://github.com/tokio-rs/console/tree/main/tokio-console" 

tokio-console/README.md

@@ -167,7 +167,7 @@ console project.
 ## Supported Rust Versions
 
 The Tokio console is built against the latest stable release. The minimum
-supported version is 1.56. The current Tokio console version is not guaranteed
+supported version is 1.58. The current Tokio console version is not guaranteed
 to build on Rust versions earlier than the minimum supported version.
 
 ## License