Update package.json

Author: volkmarnissen

package.json

@@ -16,6 +16,7 @@
     "url": "https://github.com/modbus2mqtt/server.shared"
   },
   "scripts": {
+    "test": "echo 'no Tests'",
     "build.cjs": "tsc --build tsconfig.cjs.json && echo '{\"type\": \"commonjs\"}' > cjs/package.json",
     "build.esm": "tsc --build tsconfig.json && echo '{\"type\": \"module\"}' > esm/package.json",
     "build": "npm run build.cjs && npm run build.esm",