Include id in Thread's Debug implementation
Include id in Thread's Debug implementation

Since Rust 1.19.0, id is a stable method, so there is no reason to
not include it in Debug implementation.

aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust