mention prettyplease for formatting generated code

README.md

@@ -233,15 +233,15 @@ macro.
 ## Non-macro code generators
 
 When using `quote` in a build.rs or main.rs and writing the output out to a
-file, consider having the code generator pass the tokens through [rustfmt]
-before writing (either by shelling out to the `rustfmt` binary or by pulling in
-the `rustfmt` library as a dependency). This way if an error occurs in the
-generated code it is convenient for a human to read and debug.
+file, consider having the code generator pass the tokens through [prettyplease] or [rustfmt]
+before writing. This way if an error occurs in the generated code it is
+convenient for a human to read and debug.
 
 Be aware that no kind of hygiene or span information is retained when tokens are
 written to a file; the conversion from tokens to source code is lossy.
 
 [rustfmt]: https://github.com/rust-lang/rustfmt
+[prettyplease]: https://github.com/dtolnay/prettyplease
 
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