Remove references to cfg(mutate) from lint allow - no longer allowed

Also fix incorrect spelling of honggfuzz

README.md

@@ -148,7 +148,7 @@ alias build-docs='RUSTDOCFLAGS="--cfg docsrs" cargo +nightly rustdoc --features=
 Unit and integration tests are available for those interested, along with benchmarks. For project
 developers, especially new contributors looking for something to work on, we do:
 
-- Fuzz testing with [`Hongfuzz`](https://github.com/rust-fuzz/honggfuzz-rs)
+- Fuzz testing with [`Honggfuzz`](https://github.com/rust-fuzz/honggfuzz-rs)
 - Mutation testing with [`cargo-mutants`](https://github.com/sourcefrog/cargo-mutants)
 - Code verification with [`Kani`](https://github.com/model-checking/kani)
 

bitcoin/Cargo.toml

@@ -95,4 +95,4 @@ name = "io"
 required-features = ["std"]
 
 [lints.rust]
-unexpected_cfgs = { level = "deny", check-cfg = ['cfg(bench)', 'cfg(fuzzing)', 'cfg(kani)', 'cfg(mutate)'] }
+unexpected_cfgs = { level = "deny", check-cfg = ['cfg(bench)', 'cfg(fuzzing)', 'cfg(kani)'] }

primitives/Cargo.toml

@@ -38,9 +38,6 @@ bincode = "1.3.1"
 all-features = true
 rustdoc-args = ["--cfg", "docsrs"]
 
-[lints.rust]
-unexpected_cfgs = { level = "deny", check-cfg = ['cfg(mutate)'] }
-
 [lints.clippy]
 # Exclude lints we don't think are valuable.
 needless_question_mark = "allow" # https://github.com/rust-bitcoin/rust-bitcoin/pull/2134