miner: fix status on workers.

lib/bcoin/miner.js

@@ -120,6 +120,10 @@ Miner.prototype._init = function _init() {
     this.workerPool.on('error', function(err) {
       self.emit('error', err);
     });
+
+    this.workerPool.on('status', function(stat) {
+      self.emit('status', stat);
+    });
   }
 };