v16: ExtrinsicMetadata still needs a Vec<u8> for versions

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

frame-metadata/src/v16.rs

@@ -185,6 +185,8 @@ impl IntoPortable for RuntimeApiMethodParamMetadata {
 	serde(bound(serialize = "T::Type: Serialize, T::String: Serialize"))
 )]
 pub struct ExtrinsicMetadata<T: Form = MetaForm> {
+	/// Extrinsic versions.
+	pub versions: Vec<u8>,
 	/// The type of the address that signs the extrinsic
 	pub address_ty: T::Type,
 	/// The type of the extrinsic's signature.
@@ -203,6 +205,7 @@ impl IntoPortable for ExtrinsicMetadata {
 
 	fn into_portable(self, registry: &mut Registry) -> Self::Output {
 		ExtrinsicMetadata {
+			versions: self.versions,
 			address_ty: registry.register_type(&self.address_ty),
 			signature_ty: registry.register_type(&self.signature_ty),
 			transaction_extensions_by_version: self.transaction_extensions_by_version,