please support new transactional check endpoints #32
Description
For transactional checks, there's a new set of GET endpoints to retrieve information about them. It'd be great if this library supported them as well:
https://api.pingdom.com/api/2.0/tms.recipes
https://api.pingdom.com/api/2.0/tms.summary.performance/
https://api.pingdom.com/api/2.0/tms.summary.outage/
https://api.pingdom.com/api/2.0/tms.summary.average/