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/consensus/aura/src/lib.rs

@@ -781,7 +781,7 @@ mod tests {
 
 	#[test]
 	fn authoring_blocks() {
-		::env_logger::init().ok();
+		let _ = ::env_logger::try_init();
 		let mut net = AuraTestNet::new(3);
 
 		net.start();