Merge pull request #283 from killercup/patch-6

be more precise about serde_{derive,json}

Author: steveklabnik

_posts/2018-10-25-Rust-1.30.0.md

@@ -31,7 +31,7 @@ of "Rust 2018." For more on that concept, please see our previous post
 ## Procedural Macros
 
 Way back in [Rust 1.15], we announced the ability to define "custom derives." For example,
-with `serde_json`, you could
+with `serde_derive`, you could
 
 ```rust
 #[derive(Serialize, Deserialize, Debug)]
@@ -40,8 +40,8 @@ struct Pet {
 }
 ```
 
-And convert a `Pet` to and from JSON because `serde_json` defined `Serialize` and
-`Deserialize` in a procedural macro.
+And convert a `Pet` to and from JSON using `serde_json` because `serde_derive`
+defined `Serialize` and `Deserialize` in a procedural macro.
 
 Rust expands on this by adding the ability to define two other kinds of
 advanced macros, "attribute-like procedural macros" and "function-like