Add rest-color range support

README.md

@@ -55,6 +55,7 @@ wled effects
 wled effects rainbow
 wled presets
 wled set --color blue --range 70-80 --brightness 50%
+wled set --color green --range 90-100 --effect blink --rest-color white
 wled set --hex '#00ff88' --effect solid
 wled set --preset 1
 wled raw /json/info
@@ -64,6 +65,7 @@ wled raw /json/info
 
 - `--range` is **1-based inclusive**. So `70-80` means LEDs 70 through 80.
 - `--brightness` accepts `1-255` or a percentage like `50%`.
+- `--rest-color` / `--rest-hex` lets you paint the LEDs outside the selected range in one shot.
 - `--effect` accepts a numeric id or a fuzzy name match.
 - `--preset` accepts a numeric id or a fuzzy preset name match.
 - For new integrations, prefer WLED's JSON API docs: https://kno.wled.ge/interfaces/json-api/