Update API base URL for rebranded endpoints
Update API base URL for rebranded endpoints

Toggl is now TogglTrack, update the base URL used in the API calls, so
I am prepared when the old URL is deprecated.

Issue: #23
Change-Id: I76b8182c860f432503e1d55f52b56fd5c4e90a71

gcaufield/TogglIQ