* add lkb as a seller of helix pcbs outside of japan
* Update keyboards/helix/readme.md
Keyboard Maintainer: [Makoto Kurauchi](https://github.com/MakotoKurauchi/) [@pluis9](https://twitter.com/pluis9)
Hardware Supported: Helix PCB Alpha, Beta, Pro Micro
-Hardware Availability: [PCB & Case Data](https://github.com/MakotoKurauchi/helix), [Yushakobo Shop](https://yushakobo.jp/shop/)
+Hardware Availability: [PCB & Case Data](https://github.com/MakotoKurauchi/helix), [Yushakobo Shop](https://yushakobo.jp/shop/), [Little Keyboards](https://littlekeyboards.com/collections/helix)
Make example for this keyboard (after setting up your build environment):