Add renovate.json (#202)

Co-authored-by: Renovate Bot <[email protected]>

Author: joomla-dependency-bot

renovate.json

@@ -0,0 +1,18 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:base",
+    ":preserveSemverRanges",
+    ":disableMajorUpdates"
+  ],
+  "versioning": "semver",
+  "dependencyDashboard": true,
+  "lockFileMaintenance": {
+    "enabled": true
+  },
+  "composerIgnorePlatformReqs": [
+    "ext-*",
+    "lib-*"
+  ],
+  "rangeStrategy": "update-lockfile"
+}