Heat index "feels like" reporting inaccurate numbers

[parnic]

Platform: Windows 10 (run from WSL Bash) and viewed with Chrome 65. Also seen with RPi Zero W host with Midori 0.4.3 browser.

Node Version: Seen with LTS 8.10.0 and 8.11.1

MagicMirror Version: 2.3.1

Description: "Feels like" heat index on the currentweather module is reporting wildly inaccurate values in Fahrenheit.

Steps to Reproduce: Use the following currentweather config and hope that it's still hot outside. :)

                                location: "McKinney",
                                locationID: "4710178",
                                appid: "your app id",
                                roundTemp: true,
                                appendLocationNameToHeader: false

Expected Results: A (more or less) accurate "feels like" temperature.

Actual Results: Fatal heat levels.

Configuration: See 'steps to reproduce'. Global config uses units: "imperial",

[nhubbard]

@parnic Good PR! I will approve momentarily. This causes some unbelievably funny issues without your fix, especially in Kelvin (default).

[nhubbard]

Specifically, temperatures of nearly 1500 degrees outside.

[parnic]

I didn't modify how it was treating Kelvin, so an additional change may be necessary.

[MichMich]

Merged.