fix storage

[dierbei]

After several tests, now persistent LogEntry to disk truncates the file, and the data can't be recovered after reboot.

Hopefully some improvements can be made, please help me with the review, thanks!

raft-rs/src/storage.rs

Lines 60 to 63 in 85ec6c2

	let mut file = File::create(&self.path).await.map_err(Error::Io)?;
	file.write_all(&data_with_checksum)
	.await
	.map_err(Error::Io)?;

[vaibhawvipul]

LGTM. I was working on it myself. Great work! Thank you! ❤️