LoadAddon was deprecated in patch 10.2.0 and will be removed in patch 11.0.2.

https://github.com/mitchnull/RangeDisplay/blob/39db2667c33e9ed120b345e52ce171807c4008a5/RangeDisplay.lua#L894

should be

```
self.optionsLoaded, self.optionsLoadError = C_AddOns.LoadAddOn(OptionsAppName)
```