[RPC] Move runtime version from chain to state (#1243)

* Move runtimeVersion to state, add rudimentary test for subscription.

* Bump to latest jsonrpc.

substrate/core/rpc/src/chain/tests.rs

@@ -17,7 +17,7 @@
 use super::*;
 use jsonrpc_macros::pubsub;
 use test_client::{self, TestClient};
-use test_client::runtime::{Block, Header, VERSION};
+use test_client::runtime::{Block, Header};
 use consensus::BlockOrigin;
 
 #[test]
@@ -246,19 +246,3 @@ fn should_notify_about_finalised_block() {
 	// no more notifications on this channel
 	assert_eq!(core.block_on(next.into_future()).unwrap().0, None);
 }
-
-#[test]
-fn should_return_runtime_version() {
-	let core = ::tokio::runtime::Runtime::new().unwrap();
-	let remote = core.executor();
-
-	let client = Chain {
-		client: Arc::new(test_client::new()),
-		subscriptions: Subscriptions::new(remote),
-	};
-
-	assert_matches!(
-		client.runtime_version(None.into()),
-		Ok(ref ver) if ver == &VERSION
-	);
-}