[ImgBot] Optimize images

*Total -- 4,451.64kb -> 4,266.14kb (4.17%)

/screenshot/sample_1.png -- 379.02kb -> 316.07kb (16.61%)
/app/src/main/res/drawable-xhdpi/img24.png -- 70.56kb -> 62.82kb (10.97%)
/app/src/main/res/drawable-hdpi/p16.png -- 379.90kb -> 341.21kb (10.19%)
/paletteimageview/src/main/res/mipmap-xxxhdpi/ic_launcher.png -- 10.24kb -> 9.45kb (7.73%)
/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png -- 10.24kb -> 9.45kb (7.73%)
/app/src/main/res/mipmap-xxhdpi/ic_launcher.png -- 7.54kb -> 7.04kb (6.66%)
/paletteimageview/src/main/res/mipmap-xxhdpi/ic_launcher.png -- 7.54kb -> 7.04kb (6.66%)
/paletteimageview/src/main/res/mipmap-xhdpi/ic_launcher.png -- 4.73kb -> 4.46kb (5.76%)
/app/src/main/res/mipmap-xhdpi/ic_launcher.png -- 4.73kb -> 4.46kb (5.76%)
/app/src/main/res/mipmap-xhdpi/test1.jpg -- 204.87kb -> 194.17kb (5.22%)
/app/src/main/res/drawable-xhdpi/img22.jpg -- 166.78kb -> 158.34kb (5.06%)
/app/src/main/res/mipmap-hdpi/ic_launcher.png -- 3.34kb -> 3.24kb (2.9%)
/paletteimageview/src/main/res/mipmap-hdpi/ic_launcher.png -- 3.34kb -> 3.24kb (2.9%)
/app/src/main/res/mipmap-xhdpi/test2.jpg -- 339.62kb -> 330.75kb (2.61%)
/screenshot/demo2.gif -- 117.85kb -> 114.99kb (2.43%)
/app/src/main/res/mipmap-xhdpi/test3.jpg -- 231.87kb -> 226.26kb (2.42%)
/paletteimageview/src/main/res/mipmap-mdpi/ic_launcher.png -- 2.15kb -> 2.10kb (2.4%)
/app/src/main/res/mipmap-mdpi/ic_launcher.png -- 2.15kb -> 2.10kb (2.4%)
/app/src/main/res/mipmap-xhdpi/test4.jpg -- 51.44kb -> 50.49kb (1.86%)
/screenshot/demo4.gif -- 650.41kb -> 639.74kb (1.64%)
/screenshot/title.gif -- 1,567.60kb -> 1,545.10kb (1.44%)
/screenshot/demo3.gif -- 107.79kb -> 106.36kb (1.33%)
/screenshot/demo1.gif -- 127.93kb -> 127.28kb (0.51%)

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