* also automatically use hibp api key with direnv and in CI
* check for rate-limit
* don't interpret rate-limit in tests as a failure
* report errors properly
* change hibp schema's date field to string, as the date format would
prevent direct unmarshaling. instead, marshal to string, convert later
* the scheduler is in place in order not to get throttled after going
over API limit
* the scheduler detects when in testing mode and changes little bits of
behaviour
* add tests for some basic requests
* run the requests scheduler as a background service during testing
