chore: remove duplicated section from tracing/README.md (#1046)

In `tracing/README.md`, the section  "Supported Rust Versions" was 
presented twice with the same content.

tracing/README.md

@@ -324,20 +324,6 @@ be invoked with the same syntax as the similarly-named macros from the `log`
 crate. Often, the process of converting a project to use `tracing` can begin
 with a simple drop-in replacement.
 
-## Supported Rust Versions
-
-Tracing is built against the latest stable release. The minimum supported
-version is 1.42. The current Tracing version is not guaranteed to build on Rust
-versions earlier than the minimum supported version.
-
-Tracing follows the same compiler support policies as the rest of the Tokio
-project. The current stable Rust compiler and the three most recent minor
-versions before it will always be supported. For example, if the current stable
-compiler version is 1.45, the minimum supported version will not be increased
-past 1.42, three minor versions prior. Increasing the minimum supported compiler
-version is not considered a semver breaking change as long as doing so complies
-with this policy.
-
 ## Ecosystem
 
 ### Related Crates