Merge pull request #174 from designorant/master

Add index.js to save everyone fiddling with their eslint and/or flow configs

# Tested on iOS and Android by @gantman before merging

index.js

@@ -0,0 +1,9 @@
+import { Platform } from "react-native";
+import LinearGradientIos from "./index.ios.js";
+import LinearGradientAndroid from "./index.android.js";
+
+const LinearGradient = Platform.OS === "ios"
+  ? LinearGradientIos
+  : LinearGradientAndroid;
+
+export default LinearGradient;