Enable edition 2018

Enable edition 2018 in the manifest and remove usage of `extern crate`.

Author: tcharding

integration_test/Cargo.toml

@@ -2,6 +2,7 @@
 name = "integration_tests_miniscript"
 version = "0.1.0"
 authors = ["Steven Roose <[email protected]>", "Sanket K <[email protected]>"]
+edition = "2018"
 
 [dependencies]
 miniscript = {path = "../"}

integration_test/src/main.rs

@@ -2,12 +2,6 @@
 //!
 //! This is how some external user would use rust-miniscript
 
-extern crate bitcoincore_rpc;
-extern crate log;
-
-extern crate bitcoin;
-extern crate miniscript;
-
 use bitcoincore_rpc::{Auth, Client, RpcApi};
 
 mod test_cpp;

integration_test/src/test_util.rs

@@ -17,12 +17,10 @@
 //! The keys/hashes are automatically translated so that the tests knows how to satisfy things that don't end with !
 //!
 
-extern crate rand;
-
-use self::rand::RngCore;
 use bitcoin::hashes::{hex::ToHex, Hash};
 use miniscript::descriptor::{SinglePub, SinglePubKey};
 use miniscript::{Descriptor, DescriptorPublicKey, Miniscript, ScriptContext, TranslatePk};
+use rand::RngCore;
 use std::str::FromStr;
 
 use bitcoin;