ed25519-zebra v3.0.0

ed25519-zebra 3.0.0 upgrades rand to 0.8 and rand_core to 0.6. Since they are specified in the signing API, this is a backwards-incompatible API change, thus the major version bump.

Plus:

What's Changed

• Fix typo by @rex4539 in #32
• Add Zeroize impl for SigningKey by @kim in #34
• Add JNI code for ed25519-zebra by @droark in #37
• Update rand_core to 0.6 and rand to 0.8 by @dconnolly in #44
• dependencies: update zeroize to 1.2 by @FintanH in #52

New Contributors

• @rex4539 made their first contribution in #32
• @kim made their first contribution in #34
• @droark made their first contribution in #37
• @jsdanielh made their first contribution in #51
• @FintanH made their first contribution in #52

Full Changelog: 2.2.0...3.0.0