Use ed25519-dalek v3.0.0-pre.0 crate release (#390)

Switches from a git-sourced branch to a crate release

Author: tarcieri

Cargo.lock

@@ -16,6 +16,3 @@ ssh-cipher = { path = "./ssh-cipher" }
 ssh-derive = { path = "./ssh-derive" }
 ssh-encoding = { path = "./ssh-encoding" }
 ssh-key = { path = "./ssh-key" }
-
-# https://github.com/dalek-cryptography/curve25519-dalek/pull/676
-ed25519-dalek = { git = "https://github.com/dalek-cryptography/curve25519-dalek.git", branch = "rustcrypto-new-releases" }

Cargo.toml

@@ -29,7 +29,7 @@ zeroize = { version = "1", default-features = false }
 argon2 = { version = "0.6.0-rc.0", optional = true, default-features = false, features = ["alloc"] }
 bcrypt-pbkdf = { version = "0.11.0-rc.0", optional = true, default-features = false, features = ["alloc"] }
 dsa = { version = "0.7.0-rc.2", optional = true, default-features = false, features = ["hazmat"] }
-ed25519-dalek = { version = "=2.2.0-pre", optional = true, default-features = false }
+ed25519-dalek = { version = "=3.0.0-pre.0", optional = true, default-features = false }
 hex = { version = "0.4", optional = true, default-features = false, features = ["alloc"] }
 hmac = { version = "0.13.0-rc.0", optional = true }
 home = { version = "0.5", optional = true }