[159467985] Multi-user pingdom
[159467985] Multi-user pingdom

We have moved to using the GaaP pingdom account, which is using
multi-user Pingdom.

In order to make requests to the Pingdom API for multi-user accounts we
must pass the header 'Account-Email', the value of which is
'gaap-billing@digital.cabinet-office.gov.uk'.

0.3.2 is the version which has this update

solo @tlwr

alphagov/stagecraft,alphagov/stagecraft,alphagov/stagecraft,alphagov/stagecraft