bump kovan snapshot version

ethcore/src/snapshot/service.rs

@@ -558,9 +558,9 @@ impl SnapshotService for Service {
 		self.reader.read().as_ref().map(|r| r.manifest().clone())
 	}
 
-	fn min_supported_version(&self) -> Option<u64> {
+	fn supported_versions(&self) -> Option<(u64, u64)> {
 		self.engine.snapshot_components()
-			.map(|c| c.min_supported_version())
+			.map(|c| (c.min_supported_version(), c.current_version()))
 	}
 
 	fn chunk(&self, hash: H256) -> Option<Bytes> {

ethcore/src/snapshot/snapshot_service_trait.rs

@@ -27,9 +27,9 @@ pub trait SnapshotService : Sync + Send {
 	/// Query the most recent manifest data.
 	fn manifest(&self) -> Option<ManifestData>;
 
-	/// Get the minimum supported snapshot version number.
+	/// Get the supported range of snapshot version numbers.
 	/// `None` indicates warp sync isn't supported by the consensus engine.
-	fn min_supported_version(&self) -> Option<u64>;
+	fn supported_versions(&self) -> Option<(u64, u64)>;
 
 	/// Get raw chunk for a given hash.
 	fn chunk(&self, hash: H256) -> Option<Bytes>;

sync/src/chain.rs

@@ -504,7 +504,7 @@ impl ChainSync {
 	}
 
 	fn maybe_start_snapshot_sync(&mut self, io: &mut SyncIo) {
-		if !self.enable_warp_sync || io.snapshot_service().min_supported_version().is_none() {
+		if !self.enable_warp_sync || io.snapshot_service().supported_versions().is_none() {
 			return;
 		}
 		if self.state != SyncState::WaitingPeers && self.state != SyncState::Blocks && self.state != SyncState::Waiting {
@@ -1044,11 +1044,11 @@ impl ChainSync {
 			Ok(manifest) => manifest,
 		};
 
-		let is_supported_version = io.snapshot_service().min_supported_version()
-			.map_or(false, |v| manifest.version >= v);
+		let is_supported_version = io.snapshot_service().supported_versions()
+			.map_or(false, |(l, h)| manifest.version >= l && manifest.version <= h);
 
 		if !is_supported_version {
-			trace!(target: "sync", "{}: Snapshot manifest version too low: {}", peer_id, manifest.version);
+			trace!(target: "sync", "{}: Snapshot manifest version not supported: {}", peer_id, manifest.version);
 			io.disable_peer(peer_id);
 			self.continue_sync(io);
 			return Ok(());