Merge pull request 'Configure Renovate' (#2) from renovate/configure into master

Reviewed-on: http://www.gavania.de/hodasemi/Arduino-Pedal-Effects/pulls/2

renovate.json

@@ -0,0 +1,6 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:base"
+  ]
+}