Fix validator offences (#389)

bin/node/runtime/src/lib.rs

@@ -78,7 +78,7 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
     // and set impl_version to equal spec_version. If only runtime
     // implementation changes and behavior does not, then leave spec_version as
     // is and increment impl_version.
-    spec_version: 2,
+    spec_version: 3,
     impl_version: 1,
     apis: RUNTIME_API_VERSIONS,
     transaction_version: 1,
@@ -472,7 +472,7 @@ parameter_types! {
 impl pallet_offences::Config for Runtime {
     type Event = Event;
     type IdentificationTuple = pallet_session::historical::IdentificationTuple<Self>;
-    type OnOffenceHandler = ();
+    type OnOffenceHandler = Staking;
     type WeightSoftLimit = OffencesWeightSoftLimit;
 }