8d808a2df6
Updated code sample in chapter on syntax extensions.
The affected API apparently had changed with commit d59accfb065843d12db9180a4f504664e3d23ef1.
---
Further more I had to add
```toml
[lib]
name = "roman_numerals"
crate-type = ["dylib"]
```
to `Cargo.toml` as I otherwise got this compiler error (despite `#![crate_type="dylib"]`):
[E0457]: plugin `roman_numerals` only found in rlib format, but must be available in dylib format
Might be worth adding a note about that?
Rust documentations
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