Updated to newest versions of dependencies.

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Please Review My Changes Extremely Carefully!

As I don't fully understand your code I tried to update the decencies and apply the api changes so the code would compile. However I'm not completely confident, that everything I've done was right and as this is security software I want to be sure it's actually as secure as it can be.

Thanks for writing this amazing crate! 😄 I want to use it in production soon so I figured I try to update it. Have an amazing day!

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Oh and maybe consider updating the version in the Cargo.toml file. I honestly forgot that. Maybe also push this version onto crates.io.

Just a little question: When do you plan to implement the future plans?