Fix diverging webhook object structure

No idea why, but on the server, all data is contained within a single
'payload' property, while I've never seen any such property on my
machine. Could be different node or express versions, but in any case,
this should fix it so that it just works no matter what.

index.js

@@ -246,6 +246,10 @@ const Web3 = require('web3');
     robot.router.post('/incoming/kredits/github/'+process.env.KREDITS_WEBHOOK_TOKEN, (req, res) => {
       let evt = req.header('X-GitHub-Event');
       let data = req.body;
+      // For some reason data is contained in a payload property on one
+      // machine, but directly in the root of the object on others
+      if (data.payload) { data = data.payload; }
+
       robot.logger.info(`Received GitHub hook. Event: ${evt}, action: ${data.action}`);
 
       if (evt === 'pull_request' && data.action === 'closed') {