v0.0.7: Make the collector return an error if unable to fetch device list

The collector returned HTTP 200 even in case it occurred while fetching
device stats from the box.

v0.0.6 Don't try to parse temperature and power data for absent devices

Absent devices don't provide temperature and power date which results in parsing errors in stringToFloatMetric. As API knows about the absence of a device, reading temperature and power data can easily be skipped.

This commit also adds a test case for the collector that would have catched this issue.

This release deprecates the environment variables FRITZBOX_USER and FRITZBOX_PASSWORD in favor of USERNAME and PASSWORD to align with the other flags.
FRITZBOX_USER and FRITZBOX_PASSWORD will still be used, but a message will be printed, asking to migrate away from them.

v0.0.5

• Read default user/password from environment variables. Thanks @juergenhoetzel

Migrate from dep to go modules

Merge pull request #1 from jayme-github/migrate_to_go_modules

Migrate from dep to go modules

v0.0.3

Add link to grafana dashboard

v0.0.2

Fix switch mode

v0.0.1

Fix build and release