Remove migration code. (#5291)

* Remove migration code.

* Fix cargo

* Bump spec version

substrate/bin/node-template/runtime/src/lib.rs

@@ -162,7 +162,7 @@ impl system::Trait for Runtime {
 	/// This type is being generated by `construct_runtime!`.
 	type ModuleToIndex = ModuleToIndex;
 	/// What to do if a new account is created.
-	type MigrateAccount = (); type OnNewAccount = ();
+	type OnNewAccount = ();
 	/// What to do if an account is fully reaped from the system.
 	type OnKilledAccount = ();
 	/// The data to be stored in an account.