Merge pull request #34 from line/stp-message-compressed-img

Fix for ShareTargetPicker message assets

Author: kazuma0129

public/assets/stp_image.jpg

@@ -19,16 +19,16 @@ export const SHARE_TARGET_PICKER_FIXED_ARGUMENT_LIST = [
     label: 'image',
     value: {
       type: 'image',
-      originalContentUrl: `${base}/assets/stp_image.png`,
-      previewImageUrl: `${base}/assets/stp_image.png`,
+      originalContentUrl: `${base}/assets/stp_image.jpg`,
+      previewImageUrl: `${base}/assets/stp_image.jpg`,
     },
   },
   {
     label: 'video',
     value: {
       type: 'video',
       originalContentUrl: `${base}/assets/stp_video.mp4`,
-      previewImageUrl: `${base}/assets/stp_video.mp4`,
+      previewImageUrl: `${base}/assets/stp_image.jpg`,
       trackingId: 'track-id',
     },
   },