seckey 0.9.0

Use `memsec` protected secret memory.
Documentation
# seckey
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Use [memsec](https://github.com/quininer/memsec) protected secret memory.

### exmaple

```rust
use seckey::SecKey;

let secpass = SecKey::new([8u8; 8]).unwrap();

{
	assert_eq!([8u8; 8], *secpass.read());
}

{
	let mut wpass = secpass.write();
	wpass[0] = 0;
	assert_eq!([0, 8, 8, 8, 8, 8, 8, 8], *wpass);
}
```