Update IMAGE_ABI_VERSION which wasn't updated after color_range enum was introduced.

Change-Id: I83703851f65f93573ebf7d2c0d0f056ba879c07a

vpx/vpx_image.h

@@ -28,7 +28,7 @@ extern "C" {
    * types, removing or reassigning enums, adding/removing/rearranging
    * fields to structures
    */
-#define VPX_IMAGE_ABI_VERSION (3) /**<\hideinitializer*/
+#define VPX_IMAGE_ABI_VERSION (4) /**<\hideinitializer*/
 
 
 #define VPX_IMG_FMT_PLANAR     0x100  /**< Image is a planar format. */