some power info for testing

src/en/overlay/display-o-tron-hat.md

@@ -5,6 +5,7 @@ manufacturer: Pimoroni
 url: https://github.com/pimoroni/dot3k
 description: A 3-line character LCD with a 6-zone RGB backlight and 6 touch buttons
 pincount: 40
+power: 3v3,5v
 pin:
   '3':
     mode: i2c

src/en/overlay/display-o-tron.md

@@ -18,6 +18,7 @@ install:
     - 'dot3k'
   'examples': 'python/examples/'
 pincount: 40
+power: 3v3,5v
 pin:
   '3':
     mode: i2c

src/en/overlay/piglow.md

@@ -7,6 +7,7 @@ github: https://github.com/pimoroni/piglow
 buy: http://shop.pimoroni.com/products/piglow
 description: Simply 18 LEDs in a spiral pattern controllable in Python.
 pincount: 26
+power: 3v3,5v
 pin:
   '3':
     mode: i2c

src/en/overlay/scroll-phat.md

@@ -19,6 +19,7 @@ install:
   'examples': 'examples/'
 formfactor: 'pHAT'
 pincount: 40
+power: 5v
 i2c:
 '0x60':
     name: Matrix LED driver

src/en/overlay/skywriter-hat.md

@@ -16,6 +16,11 @@ install:
     - 'skywriter'
   'examples': 'python/examples/'
 pincount: 40
+power: 3v3
+i2c:
+  '0x42':
+    name: Gesture sensor
+    device: MGC3130
 pin:
   '3':
     mode: i2c