add NewMinedBlockEvent

Author: zelig

core/events.go

@@ -10,3 +10,6 @@ type TxPostEvent struct{ Tx *types.Transaction }
 
 // NewBlockEvent is posted when a block has been imported.
 type NewBlockEvent struct{ Block *types.Block }
+
+// NewMinedBlockEvent is posted when a block has been imported.
+type NewMinedBlockEvent struct{ Block *types.Block }