Upgrade codec to 2.0 and bitvec to 0.20 (companion) (#2343)

* upgrade codec and bitvec

* "Update Substrate"

Co-authored-by: parity-processbot <>

polkadot/statement-table/Cargo.toml

@@ -5,6 +5,6 @@ authors = ["Parity Technologies <admin@parity.io>"]
 edition = "2018"
 
 [dependencies]
-parity-scale-codec = { version = "1.3.6", default-features = false, features = ["derive"] }
+parity-scale-codec = { version = "2.0.0", default-features = false, features = ["derive"] }
 sp-core = { git = "https://github.com/paritytech/substrate", branch = "master" }
 primitives = { package = "polkadot-primitives", path = "../primitives" }

polkadot/statement-table/src/generic.rs

@@ -65,13 +65,13 @@ pub enum Statement<Candidate, Digest> {
 	/// Broadcast by an authority to indicate that this is its candidate for inclusion.
 	///
 	/// Broadcasting two different candidate messages per round is not allowed.
-	#[codec(index = "1")]
+	#[codec(index = 1)]
 	Candidate(Candidate),
 	/// Broadcast by a authority to attest that the candidate with given digest is valid.
-	#[codec(index = "2")]
+	#[codec(index = 2)]
 	Valid(Digest),
 	/// Broadcast by a authority to attest that the candidate with given digest is invalid.
-	#[codec(index = "3")]
+	#[codec(index = 3)]
 	Invalid(Digest),
 }