Tweak initial config

Author: rbtcollins

.github/renovate.json

@@ -1,6 +1,9 @@
 {
-  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
-  "extends": [
-    "config:base"
-  ]
-}
+    "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+    "extends": [
+        "config:base"
+    ],
+    "labels": [
+        "dependencies"
+    ]
+}