Merge pull request #12 from caarmen/issue-11-integrate-weatherapi

Issue #11: Add weatherapi support

Update the README to specify that the profile photos should be 500x50…

…0 resolution.

Merge pull request #9 from caarmen/fix-sunrise-sunset

Fix the calculation of sunrise/sunset for regions quite west to utc.

Merge pull request #6 from caarmen/support-multiple-slack-accounts

Support multiple slack accounts

Add a small buffer when scheduling based on sunrise/sunset.

Ensure the function will really be called after sunrise/sunset has occurred.

Do a profile update when the sun sets, even if it's before the normal…

… scheduled interval.

Correct `CMD` in `Dockerfile`

Merge pull request #4 from caarmen/modularize-code

Modularize code

Merge pull request #1 from caarmen/flip-images

Flip images

Improve documentation and caching.

Document the polling interval setting.
Don't attempt to update the slack profile photo if the weather condition hasn't changed since last time.