Update dependencies (#1527)

* update to latest env_logger

* roundabout dependency update

* Update to latest vengen

* Update rand to 0.6

* Update to latest rng shuffle API

* Roundabout update of dependencies

* Update rustc_hex

* Update wasm

* Fix logging setup in tests

* revert to fix test

substrate/core/keystore/src/lib.rs

@@ -77,7 +77,7 @@ struct EncryptedKey {
 
 impl EncryptedKey {
 	fn encrypt(plain: &[u8; PKCS_LEN], password: &str, iterations: u32) -> Self {
-		use rand::{Rng, OsRng};
+		use rand::{Rng, rngs::OsRng};
 
 		let mut rng = OsRng::new().expect("OS Randomness available on all supported platforms; qed");