(BUG) GE Dimmers 46203 not dimmable in HomeKit
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**Go over all the following points, and put an `x` in all the boxes that apply.
If you're unsure about any of these, don't hesitate to ask. We're here to help!**

-  [ X] That _OAuth_ is Enabled for the SmartApp under the IDE.
-  [ X] The SmartApp and Device Handler are using the latest code available.
-  [ X] That Both the SmartApps and Device Handlers have been _Published for You_ in the IDE.

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## About Your Setup
-  How many devices are detected?: 38
-  Mobile App Version(Not required): 1.6.55-452
-  SmartApp Version: 2.3.3
-  Device Handler Version:
-  Homebridge Version: 1.2.3
-  NodeJS Version:6.14.8

## Expected Behavior
The dimmer switches are dimmable from SmartTHings app but not in HomeKit.  They should be dimmable in HK as well.

## Current Behavior
They turn on/off as a switch.

## Steps to Reproduce (for bugs)
Go to HK app and the dimmers show as switches and act accordingly.  They are not dimmable.

## Context
**How has this issue affected you? What are you trying to accomplish?
**Providing context helps us come up with a solution that is most useful in the real world**

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Please include a copy of any relevant log output to assist in tracking down the bug
