Some icon sizes are missed

[fastlane-community]

Some icon sizes are missed

[ShemTovYosef]

In xcode project some icons unassigned, I'm using xcode 9.0

[ShemTovYosef]

In source code these sizes not specified

iphone: {
            '2x' => ['20x20', '29x29', '40x40', '60x60'],
            '3x' => ['20x20', '29x29', '40x40', '60x60']
          },
ipad: {
            '1x' => ['20x20', '29x29', '40x40', '76x76'],
            '2x' => ['20x20', '29x29', '40x40', '76x76', '83.5x83.5']
          },

[HairyPorker]

Hi, I am new to github and fastlane as well as ruby. I already found this plugin is really awesome. However, I am wondering how to use this plugin to generate icon with @2x naming. Thanks.