Merge pull request #564 from nats-io/deps-update

Update dependencies.md

dependencies.md

@@ -5,6 +5,6 @@ This file lists the dependencies used in this repository.
 | Dependency | License |
 |-|-|
 | asyncio | Python Software Foundation License |
-| github.com/warner/python-ed25519 | Modified MIT License |
+| https://github.com/pyca/pynacl | Apache License 2.0 |
 | github.com/aio-libs/aiohttp | Apache License 2.0 |