update expand_message API

Signed-off-by: Andrew Whitehead <cywolf@gmail.com>

Cargo.toml

@@ -18,7 +18,7 @@ rustdoc-args = [ "--html-in-header", "katex-header.html" ]
 [dev-dependencies]
 csv = ">= 1.0, < 1.2" # csv 1.2 has MSRV 1.60
 criterion = "0.3"
-hex = "0.4"
+hex-literal = "0.3"
 rand_xorshift = "0.3"
 sha2 = "0.9"
 sha3 = "0.9"
@@ -69,7 +69,7 @@ bits = ["ff/bits"]
 groups = ["group"]
 pairings = ["groups", "pairing"]
 alloc = ["group/alloc"]
-experimental = ["digest"]
+experimental = ["digest", "groups"]
 nightly = ["subtle/nightly"]
 
 [[test]]

README.md

@@ -21,7 +21,7 @@ If you want to propose "substantial" changes to this crate, please
 * `alloc` (on by default): Enables APIs that require an allocator; these include pairing optimizations.
 * `nightly`: Enables `subtle/nightly` which tries to prevent compiler optimizations that could jeopardize constant time operations. Requires the nightly Rust compiler.
 * `experimental`: Enables experimental features. These features have no backwards-compatibility guarantees and may change at any time; users that depend on specific behaviour should pin an exact version of this crate. The current list of experimental features:
-  * Hashing to curves ([Internet Draft v12](https://datatracker.ietf.org/doc/html/draft-irtf-cfrg-hash-to-curve-12))
+  * Hashing to curves ([Internet Draft v16](https://datatracker.ietf.org/doc/html/draft-irtf-cfrg-hash-to-curve-16))
 
 ## [Documentation](https://docs.rs/bls12_381)