Bump version, spec_version & substrate in prep for release v0.9.5 (#3238)

* bump spec_version and version

* bump substrate

* remove migrations

* Revert "remove migrations"

This reverts commit ceeab924d1cd5c2d3d05f24ab28315f0566f89d8.

* remove stale migration for kusama + westend

polkadot/runtime/westend/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "westend-runtime"
-version = "0.9.4"
+version = "0.9.5"
 authors = ["Parity Technologies <admin@parity.io>"]
 edition = "2018"
 build = "build.rs"

polkadot/runtime/westend/src/lib.rs

@@ -119,7 +119,7 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
 	spec_name: create_runtime_str!("westend"),
 	impl_name: create_runtime_str!("parity-westend"),
 	authoring_version: 2,
-	spec_version: 9041,
+	spec_version: 9050,
 	impl_version: 0,
 	#[cfg(not(feature = "disable-runtime-api"))]
 	apis: RUNTIME_API_VERSIONS,
@@ -1078,31 +1078,6 @@ construct_runtime! {
 	}
 }
 
-pub struct GrandpaStoragePrefixMigration;
-impl frame_support::traits::OnRuntimeUpgrade for GrandpaStoragePrefixMigration {
-	fn on_runtime_upgrade() -> frame_support::weights::Weight {
-		use frame_support::traits::PalletInfo;
-		let name = <Runtime as frame_system::Config>::PalletInfo::name::<Grandpa>()
-			.expect("grandpa is part of pallets in construct_runtime, so it has a name; qed");
-		pallet_grandpa::migrations::v3_1::migrate::<Runtime, Grandpa, _>(name)
-	}
-
-	#[cfg(feature = "try-runtime")]
-	fn pre_upgrade() -> Result<(), &'static str> {
-		use frame_support::traits::PalletInfo;
-		let name = <Runtime as frame_system::Config>::PalletInfo::name::<Grandpa>()
-			.expect("grandpa is part of pallets in construct_runtime, so it has a name; qed");
-		pallet_grandpa::migrations::v3_1::pre_migration::<Runtime, Grandpa, _>(name);
-		Ok(())
-	}
-
-	#[cfg(feature = "try-runtime")]
-	fn post_upgrade() -> Result<(), &'static str> {
-		pallet_grandpa::migrations::v3_1::post_migration::<Grandpa>();
-		Ok(())
-	}
-}
-
 /// The address format for describing accounts.
 pub type Address = sp_runtime::MultiAddress<AccountId, ()>;
 /// Block header type as expected by this runtime.
@@ -1132,7 +1107,6 @@ pub type Executive = frame_executive::Executive<
 	frame_system::ChainContext<Runtime>,
 	Runtime,
 	AllPallets,
-	GrandpaStoragePrefixMigration,
 >;
 /// The payload being signed in transactions.
 pub type SignedPayload = generic::SignedPayload<Call, SignedExtra>;