update to latest substrate (#84)

polkadot/parachain/Cargo.toml

@@ -7,7 +7,7 @@ description = "Types and utilities for creating and working with parachains"
 [dependencies]
 parity-codec = { version = "2.1", default-features = false }
 parity-codec-derive = { version = "2.1", default-features = false }
-wasmi = { version = "0.4", optional = true }
+wasmi = { version = "0.4.3", optional = true }
 error-chain = { version = "0.12", optional = true }
 
 [dev-dependencies]

polkadot/service/src/lib.rs

@@ -175,6 +175,7 @@ construct_service_factory! {
 						grandpa::Config {
 							gossip_duration: Duration::new(4, 0), // FIXME: make this available through chainspec?
 							local_key: key.clone(),
+							justification_period: 4096,
 							name: Some(service.config.name.clone())
 						},
 						link_half,