.travis.yml: Bump polyval MSRV to 1.32.0

The POLYVAL tests are failing on Rust 1.27.0, but passing on newer
versions, suggesting there may be something amiss with `core::arch`
support for `pclmulqdq` on older Rust versions.

This bumps it up to our ideal MSRV, as 1.32.0+ would allow us to replace
the dependency on the `byteorder` crate with equivalent `core`
functions.

.travis.yml

@@ -29,8 +29,8 @@ matrix:
         - cargo build --verbose --all --exclude=polyval --tests
 
     # polyval presently needs either RUSTFLAGS or non-default features
-    - name: "Rust: 1.27.0 (polyval)"
-      rust: 1.27.0
+    - name: "Rust: 1.32.0 (polyval)"
+      rust: 1.32.0
       script: ./test_polyval.sh
     - name: "Rust: stable (polyval)"
       rust: stable

polyval/README.md

@@ -38,7 +38,7 @@ dual licensed as above, without any additional terms or conditions.
 [docs-image]: https://docs.rs/polyval/badge.svg
 [docs-link]: https://docs.rs/polyval/
 [license-image]: https://img.shields.io/badge/license-Apache2.0/MIT-blue.svg
-[rustc-image]: https://img.shields.io/badge/rustc-1.27+-blue.svg
+[rustc-image]: https://img.shields.io/badge/rustc-1.32+-blue.svg
 [build-image]: https://travis-ci.org/RustCrypto/MACs.svg?branch=master
 [build-link]: https://travis-ci.org/RustCrypto/MACs
 

polyval/src/lib.rs

@@ -13,7 +13,7 @@
 //!
 //! ## Requirements
 //!
-//! - Rust 1.27.0 or newer
+//! - Rust 1.32.0 or newer
 //! - `RUSTFLAGS` with `-Ctarget-cpu` and `-Ctarget-feature`:
 //!   - x86(-64) CPU: `target-cpu=sandybridge` or newer
 //!   - SSE2 + SSE4.1: `target-feature=+sse2,+sse4.1`