[ImgBot] Optimize images

*Total -- 1,754.58kb -> 978.20kb (44.25%)

/test/fixtures/url/nested/img.png -- 76.29kb -> 42.53kb (44.25%)
/test/fixtures/es-module/img.png -- 76.29kb -> 42.53kb (44.25%)
/test/fixtures/url/img'''img.png -- 76.29kb -> 42.53kb (44.25%)
/test/fixtures/url/img'img.png -- 76.29kb -> 42.53kb (44.25%)
/test/fixtures/url/img3x.png -- 76.29kb -> 42.53kb (44.25%)
/test/fixtures/modules/tests-cases/urls/img img.png -- 76.29kb -> 42.53kb (44.25%)
/test/fixtures/url/img(img.png -- 76.29kb -> 42.53kb (44.25%)
/test/fixtures/url/img2x.png -- 76.29kb -> 42.53kb (44.25%)
/test/fixtures/url/node_modules/package/img.png -- 76.29kb -> 42.53kb (44.25%)
/test/fixtures/url/img-simple.png -- 76.29kb -> 42.53kb (44.25%)
/test/fixtures/postcss-present-env/img1x.png -- 76.29kb -> 42.53kb (44.25%)
/test/fixtures/url/img.png -- 76.29kb -> 42.53kb (44.25%)
/test/fixtures/postcss-present-env/img2x.png -- 76.29kb -> 42.53kb (44.25%)
/test/fixtures/url/other-img.png -- 76.29kb -> 42.53kb (44.25%)
/test/fixtures/modules/tests-cases/comments/img.png -- 76.29kb -> 42.53kb (44.25%)
/test/fixtures/modules/tests-cases/issue-589/img.png -- 76.29kb -> 42.53kb (44.25%)
/test/fixtures/modules/tests-cases/urls/img.png -- 76.29kb -> 42.53kb (44.25%)
/test/fixtures/url/img)img.png -- 76.29kb -> 42.53kb (44.25%)
/test/fixtures/url/img'() img.png -- 76.29kb -> 42.53kb (44.25%)
/test/fixtures/import/img.png -- 76.29kb -> 42.53kb (44.25%)
/test/fixtures/url/img1x.png -- 76.29kb -> 42.53kb (44.25%)
/test/fixtures/url/img img.png -- 76.29kb -> 42.53kb (44.25%)
/test/fixtures/url/img-from-imported.png -- 76.29kb -> 42.53kb (44.25%)

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