upside down issue on iOS device

[Jin Ho So]

_bug report

library version

"gl-react": "^3.16.0-beta.e4f3431c",
"gl-react-native": "^3.16.0-beta.e4f3431c",
"react-native-webgl": "^0.8.0",

Expected behavior

It should show image on iOS device and simulator both

Actual behavior

It only shows the image on iOS simulator, when running on device it show black screen

Steps to reproduce the behavior

1. It only shows the image {{uri:'image-path'}} on iOS simulator, but iOS device
2. I tried to change {{{uri:'image-path'}} to {{image:'image-path'}}, it shows the image on iOS device and simulator, but there is upside down issue.

[Jin Ho So]

Sorry, I guess this issue is related with 'react-native-webgl'