Limited Unbonding Chunks. (#2700)

* Limit number of unlocking chunks.

* Bump.

substrate/node/runtime/src/lib.rs

@@ -58,8 +58,8 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
 	spec_name: create_runtime_str!("node"),
 	impl_name: create_runtime_str!("substrate-node"),
 	authoring_version: 10,
-	spec_version: 87,
-	impl_version: 87,
+	spec_version: 88,
+	impl_version: 88,
 	apis: RUNTIME_API_VERSIONS,
 };