RemoteCKAN does not check for insecure certs when used as a Python module

While checking the new `--insecure` CLI parameter, I saw that RemoteCKAN does not check for unverified certs while trying out the [RemoteCKAN example in the README](https://github.com/ckan/ckanapi#remoteckan).

Contrast that with the CLI which requires the `--insecure` parameter when going against the same insecure site (https://demo.ckan.org).