better emoji

app.js

@@ -53,7 +53,7 @@ slackbot.on('start', function() {
           '\n' +
           'My code is at https://github.com/lbryio/lbry-wunderbot. I love learning new tricks.\n';
 
-        slackbot.postMessage(data.channel, helpMsg);
+        slackbot.postMessage(data.channel, helpMsg, {icon_emoji: ':bulb:'});
       }
 
       if (command === hashbot.command) {

bots/hashbot.js

@@ -53,7 +53,7 @@ function sendMiningInfo(slackbot, channel) {
         'Difficulty: ' + difficulty + '\n' +
         'Current block: ' + block + '\n' +
         '_Source: https://explorer.lbry.io_'
-      );
+      , {icon_emoji: ':miner:'});
     }
   });
 }