class Line::Bot::V2::MessagingApi::TemplateImageSize
Size of the image. This is only for the ‘imageSize` in ButtonsTemplate
. Specify one of the following values: `cover`: The image fills the entire image area. Parts of the image that do not fit in the area are not displayed. `contain`: The entire image is displayed in the image area. A background is displayed in the unused areas to the left and right of vertical images and in the areas above and below horizontal images.