Android: Fix return type of ISO (#17)

* Android: Fix return type of ISO

Returning an array is inconsistent with IOS and also gives some numbers that can't even be easily converted to the 'real' ISO you just get back automatically when this field is a string.

* fix types

Author: IsaacInsoll

android/src/main/java/com/lodev09/exify/ExifyTags.kt

@@ -68,7 +68,7 @@ val EXIFY_TAGS = arrayOf(
   arrayOf("double", ExifInterface.TAG_FOCAL_PLANE_X_RESOLUTION),
   arrayOf("double", ExifInterface.TAG_FOCAL_PLANE_Y_RESOLUTION),
   arrayOf("int", ExifInterface.TAG_GAIN_CONTROL),
-  arrayOf("array", ExifInterface.TAG_ISO_SPEED_RATINGS),
+  arrayOf("string", ExifInterface.TAG_ISO_SPEED_RATINGS),
   arrayOf("string", ExifInterface.TAG_IMAGE_UNIQUE_ID),
   arrayOf("int", ExifInterface.TAG_LIGHT_SOURCE),
   arrayOf("string", ExifInterface.TAG_MAKER_NOTE),

src/types.ts

@@ -63,7 +63,7 @@ export interface ExifTags {
   LightSource?: number
   UserComment?: string
   GainControl?: number
-  ISOSpeedRatings?: number[]
+  ISOSpeedRatings?: string
   FocalPlaneResolutionUnit?: number
   FocalPlaneXResolution?: number
   YCbCrCoefficients?: number