Decipher web service doesn't work

[stevieflow]

Something seems amiss with this online version of decipher: https://iati-decipher.publishwhatyoufund.org/demo/

After finding an organisation, this is returned

[andylolz]

The most recent commit (9e09a80) suggests this was using a heroku app as a proxy server to fetch XML. That app has almost certainly died, which is probably the cause of this error.