Update outlookwu.php

[Leosirth]

Fixes #5

The following changelog has been inserted also in the header of outlookwu.php

• Merged with latest version
• Fixed alerting
• Added Humidity
• Added HeatIndex
• Fixed Gust

The CHANGE_LOG.MD has NOT been updated, please let me know the versioning code of conduct.

Please help to test it on your setup, I'm very new to this repo.

Thanks and regards,