readme: Replace all mentions of Rust 1.22 by 1.29

Follow up on #231.
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Tim Ruffing 2020-09-21 16:09:33 +02:00 committed by GitHub
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@ -20,9 +20,9 @@ Contributions to this library are welcome. A few guidelines:
* Any breaking changes must have an accompanied entry in CHANGELOG.md
* No new dependencies, please.
* No crypto should be implemented in Rust, with the possible exception of hash functions. Cryptographic contributions should be directed upstream to libsecp256k1.
* This library should always compile with any combination of features on **Rust 1.22**.
* This library should always compile with any combination of features on **Rust 1.29**.
## A note on Rust 1.22 support
## A note on Rust 1.29 support
The build dependency `cc` might require a more recent version of the Rust compiler.
To ensure compilation with Rust 1.29.0, pin its version in your `Cargo.lock`