proj: fix new clippy unused imports finding #227
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The `std::convert::TryFrom` import is part of the rust 2021 edition
prelude and so importing it explicitly is redundant:
```
warning: the item `TryFrom` is imported redundantly
--> rcgen/src/lib.rs:41:5
|
41 | use std::convert::TryFrom;
| ^^^^^^^^^^^^^^^^^^^^^
|
::: /home/daniel/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/prelude/mod.rs:129:13
|
129 | pub use core::prelude::rust_2021::*;
| ------------------------ the item `TryFrom` is already defined here
|
= note: `#[warn(unused_imports)]` on by default
```
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The
std::convert::TryFromimport is part of the rust 2021 edition prelude and so importing it explicitly is redundant. This results in a clippy error for CI builds using nightly: