fix(package): update probot to version 9.3.1 (#100)

Author: greenkeeper[bot]

package.json

@@ -26,7 +26,7 @@
     "semantic-release": "semantic-release"
   },
   "dependencies": {
-    "probot": "9.3.0"
+    "probot": "9.3.1"
   },
   "devDependencies": {
     "@semantic-release/npm": "5.1.11",