update appendix & readme

README.md

@@ -1,10 +1,10 @@
-# Rust 程序设计语言（2021 edition 施工中）简体中文版
+# Rust 程序设计语言（2021 edition）简体中文版
 
 ![Build Status](https://github.com/KaiserY/trpl-zh-cn/workflows/CI/badge.svg)
 
 ## 状态
 
-施工中。
+施工完毕。
 
 PS:
 

src/appendix-04-useful-development-tools.md

@@ -2,7 +2,7 @@
 
 > [appendix-04-useful-development-tools.md](https://github.com/rust-lang/book/blob/main/src/appendix-04-useful-development-tools.md)
 > <br />
-> commit efbafdba3618487fbc9305318fcab9775132ac15
+> commit 5057f157cd0b35bc7d0dc0af6ef622fa4c480996
 
 本附录，我们将讨论 Rust 项目提供的用于开发 Rust 代码的工具。
 
@@ -116,14 +116,15 @@ fn main() {
 在此项目上运行 `cargo clippy` 会导致这个错误：
 
 ```text
-error: approximate value of `f{32, 64}::consts::PI` found. Consider using it directly
+error: approximate value of `f{32, 64}::consts::PI` found
  --> src/main.rs:2:13
   |
 2 |     let x = 3.1415;
   |             ^^^^^^
   |
-  = note: #[deny(clippy::approx_constant)] on by default
+  = note: `#[deny(clippy::approx_constant)]` on by default
-  = help: for further information visit https://rust-lang-nursery.github.io/rust-clippy/master/index.html#approx_constant
+  = help: consider using the constant directly
+  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#approx_constant
 ```
 
 这告诉我们 Rust 定义了更为精确的常量，而如果使用了这些常量程序将更加准确。如下代码就不会导致 `clippy` 产生任何错误或警告：

src/appendix-06-translation.md

@@ -2,7 +2,7 @@
 
 > [appendix-06-translation.md](https://github.com/rust-lang/book/blob/main/src/appendix-06-translation.md)
 > <br />
-> commit f77e8c47bd04dd68094aaa7483e9dbf4d7386b8c
+> commit 4c8d13c52c51f1c62a80b52d7fbd7cc0b63ada43
 
 一些非英语语言的资源。多数仍在翻译中；查阅 [翻译标签][label] 来帮助翻译，或者添加译本链接！
 
@@ -14,7 +14,7 @@
 - [正體中文](https://github.com/rust-tw/book-tw)
 - [Українська](https://github.com/pavloslav/rust-book-uk-ua)
 - [Español](https://github.com/thecodix/book), [alternate](https://github.com/ManRR/rust-book-es)
-- [Italiano](https://github.com/Ciro-Fusco/book_it)
+- [Italiano](https://github.com/EmanueleGurini/book_it)
 - [Русский](https://github.com/rust-lang-ru/book)
 - [한국어](https://github.com/rinthel/rust-lang-book-ko)
 - [日本語](https://github.com/rust-lang-ja/book-ja)
@@ -27,7 +27,6 @@
 - [Svenska](https://github.com/sebras/book)
 - [Farsi](https://github.com/pomokhtari/rust-book-fa)
 - [Deutsch](https://github.com/rust-lang-de/rustbook-de)
-- [Turkish](https://github.com/RustDili/dokuman/tree/master/ceviriler), [online](https://rustdili.github.io/)
 - [हिंदी](https://github.com/venkatarun95/rust-book-hindi)
 - [ไทย](https://github.com/rust-lang-th/book-th)
 - [Danske](https://github.com/DanKHansen/book-dk)