Point renovate.json at local>benkard/.github:renovate-config (#8)

diff --git a/renovate.json b/renovate.json
index 39a2b6e..69a18b5 100644
--- a/renovate.json
+++ b/renovate.json
@@ -1,6 +1,3 @@
-{
-  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
-  "extends": [
-    "config:base"
-  ]
+{ "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+, "extends": ["local>benkard/.github:renovate-config"]
 }