Add renovate

Related-to: wooorm/mdxjs-rs#9.

Reviewed-by: Titus Wormer <[email protected]>

Author: ChristianMurphy

renovate.json

@@ -0,0 +1,4 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": ["config:base", ":preserveSemverRanges"]
+}