Update .clabot

.clabot

@@ -2,7 +2,8 @@
   "contributors": [
     "expede",
     "bumblefudge",
-    "oed"
+    "oed",
+    "chunningham"
   ],
   "message": "We require contributors to sign our Contributor License Agreement, and we don't have you on file. In order for us to review and merge your code, either [PR in your signature like so](https://github.com/ChainAgnostic/varsig/pull/2/files) if you have no other disclosures to make or reach out to one more of the codeowners (@bumblefudge @expede @oed) to get yourself added manually.",
   "recheckComment": "Thank you for complying with our IP regime! We appreciate the collaboration."