[ImgBot] Optimize images

*Total -- 197.19kb -> 124.54kb (36.84%)

/assets/chinese_dark.png -- 14.38kb -> 6.10kb (57.61%)
/app/src/main/ic_launcher-playstore.png -- 51.41kb -> 27.09kb (47.3%)
/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png -- 9.49kb -> 5.71kb (39.79%)
/app/src/main/res/mipmap-xxhdpi/ic_launcher.png -- 6.49kb -> 3.96kb (39.06%)
/app/src/main/res/mipmap-xhdpi/ic_launcher.png -- 3.92kb -> 2.44kb (37.66%)
/app/src/main/res/mipmap-hdpi/ic_launcher.png -- 2.71kb -> 1.74kb (35.7%)
/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png -- 16.27kb -> 11.03kb (32.2%)
/app/src/main/res/mipmap-mdpi/ic_launcher.png -- 1.76kb -> 1.20kb (31.83%)
/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.png -- 10.91kb -> 7.50kb (31.25%)
/app/src/main/res/mipmap-xxxhdpi/ic_launcher_foreground.png -- 21.18kb -> 14.70kb (30.59%)
/app/src/main/res/mipmap-xxhdpi/ic_launcher_foreground.png -- 14.02kb -> 9.75kb (30.45%)
/app/src/main/res/mipmap-xhdpi/ic_launcher_round.png -- 6.55kb -> 4.69kb (28.42%)
/app/src/main/res/mipmap-xhdpi/ic_launcher_foreground.png -- 7.84kb -> 5.69kb (27.48%)
/app/src/main/res/mipmap-hdpi/ic_launcher_round.png -- 4.45kb -> 3.27kb (26.51%)
/app/src/main/res/mipmap-xxxhdpi/ic_launcher_background.png -- 9.00kb -> 6.64kb (26.23%)
/app/src/main/res/mipmap-mdpi/ic_launcher_round.png -- 2.72kb -> 2.02kb (25.67%)
/app/src/main/res/mipmap-hdpi/ic_launcher_foreground.png -- 5.27kb -> 3.93kb (25.39%)
/app/src/main/res/mipmap-xxhdpi/ic_launcher_background.png -- 4.61kb -> 3.62kb (21.46%)
/app/src/main/res/mipmap-mdpi/ic_launcher_foreground.png -- 3.02kb -> 2.38kb (21.3%)
/app/src/main/res/mipmap-xhdpi/ic_launcher_background.png -- 0.79kb -> 0.69kb (13.02%)
/app/src/main/res/mipmap-hdpi/ic_launcher_background.png -- 0.40kb -> 0.40kb (0.49%)

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