mod_rest: Fix type of response status codes in openapi spec https://spec.openapis.org/oas/v3.0.1#responsesObject > This field MUST be enclosed in quotation marks for compatibility > between JSON and YAML.

This module blocks configured queries that change server state.

E.g. to make vCard storage read-only:

``` lua
readonly_stores = {
	vcard = { "vcard-temp", "vCard" };
}
```