Add clippy::cargo and remove dependencies (#23)

src/group/p256.rs

@@ -27,11 +27,10 @@ use once_cell::unsync::Lazy;
 use p256_::elliptic_curve::group::prime::PrimeCurveAffine;
 use p256_::elliptic_curve::group::GroupEncoding;
 use p256_::elliptic_curve::sec1::{FromEncodedPoint, ToEncodedPoint};
-use p256_::elliptic_curve::subtle::ConstantTimeEq;
 use p256_::elliptic_curve::Field;
 use p256_::{AffinePoint, EncodedPoint, ProjectivePoint};
 use rand::{CryptoRng, RngCore};
-use subtle::{Choice, ConditionallySelectable};
+use subtle::{Choice, ConditionallySelectable, ConstantTimeEq};
 
 // `L: 48`
 pub const L: usize = 48;

src/lib.rs

@@ -425,8 +425,9 @@
 //! [curve25519-dalek](https://doc.dalek.rs/curve25519_dalek/index.html#backends-and-features) and enables parallel formulas,
 //! using either AVX2 or AVX512-IFMA. This will automatically enable the `u64_backend` and requires Rust nightly.
 
-#![cfg_attr(not(feature = "bench"), deny(missing_docs))]
 #![deny(unsafe_code)]
+#![warn(clippy::cargo, missing_docs)]
+#![allow(clippy::multiple_crate_versions)]
 #![cfg_attr(not(feature = "std"), no_std)]
 #![cfg_attr(docsrs, feature(doc_cfg))]