mod_conversejs: This one weird trick updates options on reload Options queried from the config in get_converse_options() would take effect immediately after Prosody reloads the config. Including 'conversejs_options' in this behaviour by simply moving a line seems worth it.

This module lets you block connections to any remote servers not on a
whitelist.

``` {.lua}
modules_enabled = {
    -- other modules --
    "s2s_whitelist",

}
s2s_whitelist = {
    "example.org",
}
```