Add the structured-logger crate to the README

Signed-off-by: Yan Qing <txr1883@gmail.com>

README.md

@@ -67,6 +67,7 @@ There are many available implementations to choose from, here are some of the mo
     * [`pretty_env_logger`](https://docs.rs/pretty_env_logger/*/pretty_env_logger/)
     * [`stderrlog`](https://docs.rs/stderrlog/*/stderrlog/)
     * [`flexi_logger`](https://docs.rs/flexi_logger/*/flexi_logger/)
+    * [`structured-logger`](https://docs.rs/structured-logger/latest/structured_logger/)
 * Complex configurable frameworks:
     * [`log4rs`](https://docs.rs/log4rs/*/log4rs/)
     * [`fern`](https://docs.rs/fern/*/fern/)
@@ -80,7 +81,7 @@ There are many available implementations to choose from, here are some of the mo
 * For WebAssembly binaries:
     * [`console_log`](https://docs.rs/console_log/*/console_log/)
 * For dynamic libraries:
-    * You may need to construct [an FFI-safe wrapper over `log`](https://github.com/rust-lang/log/issues/421) to initialize in your libraries. 
+    * You may need to construct [an FFI-safe wrapper over `log`](https://github.com/rust-lang/log/issues/421) to initialize in your libraries.
 * Utilities:
     * [`log_err`](https://docs.rs/log_err/*/log_err/)
 

src/lib.rs

@@ -136,6 +136,7 @@
 //!     * [pretty_env_logger]
 //!     * [stderrlog]
 //!     * [flexi_logger]
+//!     * [structured-logger]
 //! * Complex configurable frameworks:
 //!     * [log4rs]
 //!     * [fern]
@@ -311,6 +312,7 @@
 //! [win_dbg_logger]: https://docs.rs/win_dbg_logger/*/win_dbg_logger/
 //! [db_logger]: https://docs.rs/db_logger/*/db_logger/
 //! [console_log]: https://docs.rs/console_log/*/console_log/
+//! [structured-logger]: https://docs.rs/structured-logger/latest/structured_logger/
 
 #![doc(
     html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",