Configure Renovate (#5)

* Add renovate.json

* Update renovate.json

Co-authored-by: Renovate Bot <bot@renovateapp.com>
Co-authored-by: Oliver Eyton-Williams <ojeytonwilliams@gmail.com>

renovate.json

@@ -0,0 +1,16 @@
+{
+  "labels": ["renovate"],
+  "extends": ["config:base"],
+  "branchConcurrentLimit": 20,
+  "dependencyDashboard": true,
+  "major": {
+    "dependencyDashboardApproval": true
+  },
+  "packageRules": [
+    {
+      "matchUpdateTypes": ["minor", "patch", "pin", "digest"],
+      "matchCurrentVersion": "!/^0/",
+      "automerge": true
+    }
+  ]
+}