feat!: set minimal required Rust version of 1.62.

This version is motivated only when compiling on windows (but we can't differentiate that)
due to the recent addition of `CommandExt::raw_arg()`.

This might be a breaking change as previously there was no minimal supported Rust version.

Cargo.toml

@@ -10,6 +10,7 @@ description = "Open a path or URL using the program configured on the system"
 repository = "https://github.com/Byron/open-rs"
 keywords = ["open", "xdg-open", "start", "launch"]
 include = ["src/**/*", "LICENSE.md", "README.md", "changelog.md"]
+rust-version = "1.62"
 
 [[bin]]
 test = false