core/: Update libsecp256k1 from 0.6 to 0.7 (#2306)

Signed-off-by: koushiro <koushiro.cqx@gmail.com>

Author: koushiro

core/Cargo.toml

@@ -18,15 +18,15 @@ fnv = "1.0"
 futures = { version = "0.3.1", features = ["executor", "thread-pool"] }
 futures-timer = "3"
 lazy_static = "1.2"
-libsecp256k1 = { version = "0.6.0", optional = true }
+libsecp256k1 = { version = "0.7.0", optional = true }
 log = "0.4"
 multiaddr = { version = "0.13.0" }
 multihash = { version = "0.14", default-features = false, features = ["std", "multihash-impl", "identity", "sha2"] }
 multistream-select = { version = "0.10", path = "../misc/multistream-select" }
 parking_lot = "0.11.0"
 pin-project = "1.0.0"
 prost = "0.9"
-rand = "0.7"
+rand = "0.8"
 rw-stream-sink = "0.2.0"
 sha2 = "0.9.1"
 smallvec = "1.6.1"
@@ -47,6 +47,7 @@ libp2p-noise = { path = "../transports/noise" }
 libp2p-tcp = { path = "../transports/tcp" }
 multihash = { version = "0.14", default-features = false, features = ["arb"] }
 quickcheck = "0.9.0"
+rand07 = { package = "rand", version = "0.7" } 
 wasm-timer = "0.2"
 
 [build-dependencies]

core/src/identity/rsa.rs

@@ -298,7 +298,7 @@ impl DerDecodable<'_> for Asn1SubjectPublicKeyInfo {
 mod tests {
     use super::*;
     use quickcheck::*;
-    use rand::seq::SliceRandom;
+    use rand07::seq::SliceRandom;
     use std::fmt;
 
     const KEY1: &'static [u8] = include_bytes!("test/rsa-2048.pk8");

core/tests/concurrent_dialing.rs

@@ -29,7 +29,7 @@ use libp2p_core::{
     ConnectedPoint,
 };
 use quickcheck::*;
-use rand::Rng;
+use rand07::Rng;
 use std::num::NonZeroU8;
 use std::task::Poll;
 use util::{test_network, TestHandler};

core/tests/connection_limits.rs

@@ -28,13 +28,14 @@ use libp2p_core::{
     PeerId,
 };
 use quickcheck::*;
-use rand::Rng;
 use std::task::Poll;
 use util::{test_network, TestHandler};
 
 #[test]
 fn max_outgoing() {
-    let outgoing_limit = rand::thread_rng().gen_range(1, 10);
+    use rand::Rng;
+
+    let outgoing_limit = rand::thread_rng().gen_range(1..10);
 
     let limits = ConnectionLimits::default().with_max_pending_outgoing(Some(outgoing_limit));
     let cfg = NetworkConfig::default().with_connection_limits(limits);
@@ -89,6 +90,8 @@ fn max_outgoing() {
 
 #[test]
 fn max_established_incoming() {
+    use rand07::Rng;
+
     #[derive(Debug, Clone)]
     struct Limit(u32);