Fix unstable feature.
#59
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Was only on `impl From<&mut [T]> for ThinVec<T>`, no other impls. Probably just a copy-paste remnant.
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Currently, enabling the
unstablecargo feature ofthin-vecdoes not enable the Rust nightly featuretrusted_len, socargo +nightly build --features=unstablealways fails. This PR adds#![cfg_attr(feature = "unstable", feature(trusted_len))]to remedy that.Alternately, the fact that this hasn't been reported may indicate that the
unstablefeature is not used in the wild and could just be removed (or leave the feature itself and only remove the twoTrustedLenimpls gated under it).