fix: Add tintColor to Flow FastImageProps type (DylanVann#871)

Author: MichaelDanielTom

src/index.js.flow

@@ -59,6 +59,7 @@ export type FastImageProps = $ReadOnly<{|
     source?: ?(FastImageSource | number),
     defaultSource?: ?number,
 
+    tintColor?: number | string,
     resizeMode?: ?ResizeModes,
     fallback?: ?boolean,
     testID?: ?string,