feature: the key of a credential store may be a path of keys, so stores of several kinds share one object of config.json.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@koszewscy/sk-react-toolkit",
-  "version": "0.2.1",
+  "version": "0.3.0",
   "description": "Shared code of the React and Fastify web applications: web components, server helpers and the Vite font plugin.",
   "private": true,
   "type": "module",