Update rand to 0.8 and rand_core to 0.6

This makes better user experience when targeting wasm.
Closes facebook#101

Cargo.toml

@@ -26,7 +26,7 @@ generic-bytes = { version = "0.1.0" }
 generic-bytes-derive = { version = "0.1.0" }
 hkdf = "0.10.0"
 hmac = "0.10.1"
-rand_core = "0.5.1"
+rand_core = "0.6.0"
 scrypt = { version = "0.5.0", optional = true }
 sha2 = "0.9.2"
 subtle = { version = "2.3.0", default-features = false }
@@ -42,10 +42,15 @@ hex = "0.4.2"
 lazy_static = "1.4.0"
 serde_json = "1.0.60"
 proptest = "0.10.1"
-rand = "0.7"
+rand = "0.8"
 rustyline = "7.0.0"
 
 [[bench]]
 name = "oprf"
 harness = false
 required-features = ["bench"]
+
+# TEMPORARY, DO NOT MERGE
+[patch.crates-io]
+x25519-dalek = { git = "https://github.com/PaulGrandperrin/x25519-dalek.git", branch="patch-1" }
+curve25519-dalek = { git = "https://github.com/PaulGrandperrin/curve25519-dalek.git", branch="patch-1" }