Migrate to renovate (#51)

Author: inverse

.github/renovate.json

@@ -0,0 +1,9 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:recommended"
+  ],
+  "pre-commit": {
+    "enabled": true
+  }
+}