fix emiting newTransaction event

src/app.js

@@ -100,8 +100,8 @@ var css = csjs`
   }
   .centered {
     position           : fixed;
-    top                : 50%;
-    left               : 50%;
+    top                : 20%;
+    left               : 45%;
     width              : 200px;
     height             : 200px;
   }

src/blockchain/pluginUDapp.js

@@ -9,8 +9,8 @@ class PluginUdapp {
   }
 
   setupEvents () {
-    this.blockchain.event.register('newTransaction', (tx, receipt) => {
-      this.events.trigger('newTransaction', [tx, receipt])
+    this.blockchain.events.on('newTransaction', (tx, receipt) => {
+      this.events.emit('newTransaction', tx, receipt)
     })
   }