Enable grandpa migration. (#549)

* Enable grandpa migration.

* Bump runtime version

Author: gavofyork

Diff for: runtime/Cargo.toml

@@ -39,7 +39,7 @@ democracy = { package = "srml-democracy", git = "https://github.com/paritytech/s
 elections-phragmen = { package = "srml-elections-phragmen", git = "https://github.com/paritytech/substrate", default-features = false, branch = "polkadot-master" }
 executive = { package = "srml-executive", git = "https://github.com/paritytech/substrate", default-features = false, branch = "polkadot-master" }
 finality-tracker = { package = "srml-finality-tracker", git = "https://github.com/paritytech/substrate", default-features = false, branch = "polkadot-master" }
-grandpa = { package = "srml-grandpa", git = "https://github.com/paritytech/substrate", default-features = false, branch = "polkadot-master" }
+grandpa = { package = "srml-grandpa", git = "https://github.com/paritytech/substrate", default-features = false, features = ["migrate-authorities"], branch = "polkadot-master" }
 im-online = { package = "srml-im-online", git = "https://github.com/paritytech/substrate", default-features = false, branch = "polkadot-master" }
 indices = { package = "srml-indices", git = "https://github.com/paritytech/substrate", default-features = false, branch = "polkadot-master" }
 membership = { package = "srml-membership", git = "https://github.com/paritytech/substrate", default-features = false, branch = "polkadot-master" }

Diff for: runtime/src/lib.rs

@@ -99,7 +99,7 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
 	spec_name: create_runtime_str!("kusama"),
 	impl_name: create_runtime_str!("parity-kusama"),
 	authoring_version: 1,
-	spec_version: 1016,
+	spec_version: 1017,
 	impl_version: 0,
 	apis: RUNTIME_API_VERSIONS,
 };