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Update ch19-06-macros.md

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@ -191,8 +191,8 @@ $ cargo new hello_macro_derive --lib
proc-macro = true
[dependencies]
syn = "0.14.4"
quote = "0.6.3"
syn = "1.0"
quote = "1.0"
```
为定义一个过程式宏，请将示例 19-31 中的代码放在 `hello_macro_derive` crate 的 *src/lib.rs* 文件里面。注意这段代码在我们添加 `impl_hello_macro` 函数的定义之前是无法编译的。
@ -220,8 +220,7 @@ use syn;
#[proc_macro_derive(HelloMacro)]
pub fn hello_macro_derive(input: TokenStream) -> TokenStream {
// 构建 Rust 代码所代表的语法树
// 以便可以进行操作
// 将 Rust 代码解析为语法树以便进行操作
let ast = syn::parse(input).unwrap();
// 构建 trait 实现