Update readme to mention pin for 1.47

We now require pinning for `serde` and `syn` if building with toolchain
1.47. Document this in the README.
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Tobin C. Harding 2023-03-19 12:19:02 +11:00
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@ -79,7 +79,7 @@ For more information please see `./CONTRIBUTING.md`.
This library should always compile with any combination of features (minus
`no-std`) on **Rust 1.41.1** or **Rust 1.47** with `no-std`.
To build with the MSRV you will need to pin some dependencies:
To build with the MSRV you will need to pin some dependencies (also for `no-std`):
```
cargo update -p serde --precise 1.0.156
cargo update -p syn --precise 1.0.107