Run go mod tidy after renovate-bot updates deps (#39)

Reviewed-on: #39
Co-authored-by: Natercio Moniz <[email protected]>

renovate.json

@@ -13,5 +13,8 @@
       ],
       "automerge": false
     }
+  ],
+  "postUpdateOptions": [
+    "gomodTidy"
   ]
 }