chore(deps): automerge all but major updates (#183)

Also move renovate.json into .github directory.

Author: hdp617

.github/renovate.json

@@ -0,0 +1,13 @@
+{
+  "extends": [
+    "config:base"
+  ],
+  "packageRules": [
+    {
+      "updateTypes": ["minor", "patch", "pin", "digest"],
+      "automerge": true
+    }
+  ],
+  "pinVersions": false,
+  "schedule": "on monday"
+}