Update icons on the Google Play Market

Please update your icon on the Google Play Market in accordance with the new specifications. What is wrong with your icon is written in the paragraph [Brand adaptation](https://developer.android.com/google-play/resources/icon-design-specifications#brand_adaptation): "If possible, pick a background color for your asset that's appropriate for your brand and doesn't include any transparency. Transparent assets will display the background color of Google Play UI".