fix readme examples
fix readme examples

http://demo.ckan.org redirects to https://demo.ckan.org and ckanapi-exporter fails on that with a fairly cryptic error: ckanapi.errors.CKANAPIError: ['http://demo.ckan.org/api/action/package_search', 301, u'']
ckan/ckanapi-exporter,ckan/ckanapi-exporter