Add renovate.json (#3)

diff --git a/renovate.json b/renovate.json
new file mode 100644
index 0000000..f59f762
--- /dev/null
+++ b/renovate.json
@@ -0,0 +1,3 @@
+{ "$schema": "https://docs.renovatebot.com/renovate-schema.json"
+, "extends": ["local>benkard/.github:renovate-config"]
+}