Update to draft 19 (#101)

Cargo.toml

@@ -8,7 +8,7 @@ license = "MIT"
 name = "voprf"
 readme = "README.md"
 repository = "https://github.com/novifinancial/voprf/"
-rust-version = "1.60"
+rust-version = "1.61"
 version = "0.5.0-pre.2"
 
 [features]
@@ -28,7 +28,7 @@ curve25519-dalek = { version = "=4.0.0-rc.1", default-features = false, features
 derive-where = { version = "1", features = ["zeroize-on-drop"] }
 digest = "0.10"
 displaydoc = { version = "0.2", default-features = false }
-elliptic-curve = { version = "0.12", features = [
+elliptic-curve = { version = "=0.13.0-pre.5", features = [
   "hash2curve",
   "sec1",
   "voprf",
@@ -45,7 +45,7 @@ zeroize = { version = "1.5", default-features = false }
 [dev-dependencies]
 generic-array = { version = "0.14", features = ["more_lengths"] }
 hex = "0.4"
-p256 = { version = "0.12", default-features = false, features = [
+p256 = { version = "=0.13.0-pre", default-features = false, features = [
   "hash2curve",
   "voprf",
 ] }
@@ -59,3 +59,6 @@ sha2 = "0.10"
 all-features = true
 rustdoc-args = ["--cfg", "docsrs"]
 targets = []
+
+[patch.crates-io]
+p256 = { git = "https://github.com/RustCrypto/elliptic-curves", rev = "136fed7944d53c0508b1a93cd97bdab46891bcf7" }