Update link to examples

Author: ccqpein

src/lib.rs

@@ -260,7 +260,7 @@
 //! env_logger::Builder::from_env(Env::default().default_filter_or("warn")).init();
 //! ```
 //!
-//! [gh-repo-examples]: https://github.com/env-logger-rs/env_logger/tree/master/examples
+//! [gh-repo-examples]: https://github.com/env-logger-rs/env_logger/tree/main/examples
 //! [level-enum]: https://docs.rs/log/latest/log/enum.Level.html
 //! [log-crate-url]: https://docs.rs/log/
 //! [`Builder`]: struct.Builder.html