Upgrade version on crates.io

[UriNeri]

Current version on crates is 0.6.3.
Current version on github/pypi is 0.7.0

[Crispy13]

I hope that we can know why the updates have not been applied to crates.io

[audy]

Sorry about that! 0.7.0 and 0.7.1 are now on crates.io: https://crates.io/crates/needletail/versions