I checked your bot, and it has not been sent any messages from Slack, and your Slack webhook has not been called.
Check that you setup everything correctly, in particular the outgoing webhook,
Also, Slack bots can either response to only keywords in any channel, or all messages in a single channel. Make sure you set either keywords, or a channel.
If you are still having issues you can add [email protected] to your Slack admin group and we can take a look.