[ImgBot] Optimize images

*Total -- 9,948.82kb -> 9,554.71kb (3.96%)

/activestorage/test/fixtures/files/image.gif -- 1.98kb -> 0.04kb (97.88%)
/yasslab/logo_800x200.png -- 25.37kb -> 10.55kb (58.4%)
/guides/assets/images/controls.png -- 2.74kb -> 1.37kb (50%)
/guides/assets/images/btn-tweet.png -- 2.93kb -> 1.62kb (44.8%)
/guides/assets/images/icon-ruby.png -- 3.60kb -> 2.33kb (35.34%)
/guides/assets/images/bx_loader.gif -- 8.38kb -> 5.48kb (34.56%)
/guides/assets/images/rails_guides_ribbon.png -- 15.65kb -> 10.76kb (31.23%)
/guides/assets/images/cover.png -- 61.09kb -> 42.02kb (31.21%)
/guides/assets/images/btn-twitter.png -- 14.64kb -> 10.09kb (31.07%)
/guides/assets/images/rails_guides_logo.gif -- 3.68kb -> 2.64kb (28.28%)
/guides/assets/images/railsguidesjp_logo.png -- 8.14kb -> 5.96kb (26.83%)
/guides/assets/images/belongs_to.png -- 34.22kb -> 26.71kb (21.96%)
/guides/assets/images/has_many.png -- 35.38kb -> 29.84kb (15.66%)
/guides/assets/images/favicons/apple-icon.png -- 18.63kb -> 15.92kb (14.53%)
/guides/assets/images/favicons/apple-icon-precomposed.png -- 18.63kb -> 15.92kb (14.53%)
/guides/assets/images/favicons/android-icon-48x48.png -- 2.53kb -> 2.17kb (14.11%)
/guides/assets/images/favicons/apple-icon-152x152.png -- 12.46kb -> 10.71kb (14.1%)
/guides/assets/images/favicons/ms-icon-310x310.png -- 38.12kb -> 32.77kb (14.02%)
/guides/assets/images/favicons/apple-icon-180x180.png -- 16.43kb -> 14.13kb (14%)
/guides/assets/images/favicons/ms-icon-150x150.png -- 12.26kb -> 10.55kb (13.94%)
/guides/assets/images/favicons/apple-icon-144x144.png -- 11.42kb -> 9.84kb (13.77%)
/guides/assets/images/favicons/android-icon-144x144.png -- 11.42kb -> 9.84kb (13.77%)
/guides/assets/images/favicons/ms-icon-144x144.png -- 11.42kb -> 9.84kb (13.77%)
/activestorage/test/fixtures/files/icon.svg -- 1.54kb -> 1.33kb (13.67%)
/guides/assets/images/favicons/android-icon-192x192.png -- 17.97kb -> 15.52kb (13.64%)
/guides/assets/images/has_one.png -- 37.33kb -> 32.27kb (13.54%)
/guides/assets/images/favicons/apple-icon-114x114.png -- 7.91kb -> 6.85kb (13.48%)
/guides/assets/images/seminar_state.png -- 502.57kb -> 435.10kb (13.43%)
/guides/assets/images/favicons/ms-icon-70x70.png -- 3.92kb -> 3.40kb (13.26%)
/guides/assets/images/favicons/apple-icon-57x57.png -- 3.03kb -> 2.63kb (13.23%)
/guides/assets/images/favicons/favicon-96x96.png -- 6.11kb -> 5.31kb (13.11%)
/guides/assets/images/favicons/android-icon-96x96.png -- 6.11kb -> 5.31kb (13.11%)
/guides/assets/images/favicons/apple-icon-120x120.png -- 8.58kb -> 7.46kb (13.1%)
/guides/assets/images/favicons/apple-icon-60x60.png -- 3.16kb -> 2.75kb (12.96%)
/guides/assets/images/favicons/apple-icon-72x72.png -- 4.06kb -> 3.54kb (12.73%)
/guides/assets/images/favicons/android-icon-72x72.png -- 4.06kb -> 3.54kb (12.73%)
/guides/assets/images/polymorphic.png -- 82.75kb -> 72.70kb (12.15%)
/guides/assets/images/favicons/apple-icon-76x76.png -- 4.36kb -> 3.83kb (12.11%)
/guides/assets/images/has_one_through.png -- 90.37kb -> 79.83kb (11.66%)
/guides/assets/images/habtm.png -- 60.00kb -> 53.02kb (11.63%)
/guides/assets/images/logos/carbon.gif -- 9.41kb -> 8.38kb (11.03%)
/guides/assets/images/spinner.svg -- 3.32kb -> 2.97kb (10.43%)
/actionmailer/test/fixtures/attachments/test.jpg -- 1.98kb -> 1.78kb (9.96%)
/actionmailer/test/fixtures/attachments/foo.jpg -- 1.98kb -> 1.78kb (9.96%)
/actionpack/test/fixtures/multipart/ruby_on_rails.jpg -- 44.08kb -> 39.84kb (9.62%)
/guides/assets/images/has_many_through.png -- 96.52kb -> 88.06kb (8.76%)
/activestorage/test/fixtures/files/racecar.jpg -- 1,097.72kb -> 1,015.11kb (7.53%)
/guides/assets/images/seminar_state.jpg -- 108.57kb -> 102.06kb (5.99%)
/guides/assets/images/favicons/favicon-16x16.png -- 1.16kb -> 1.09kb (5.66%)
/guides/assets/images/bnr-pro-plan.jpg -- 124.30kb -> 117.60kb (5.39%)
/guides/assets/images/bnr_team.jpg -- 95.41kb -> 90.66kb (4.98%)
/guides/assets/images/bnr_pro.jpg -- 113.50kb -> 107.85kb (4.98%)
/guides/assets/images/favicons/favicon-32x32.png -- 1.69kb -> 1.62kb (3.94%)
/guides/assets/images/favicons/android-icon-36x36.png -- 1.82kb -> 1.76kb (3.59%)
/guides/assets/images/rails_guides_ebook_double.png -- 617.10kb -> 599.95kb (2.78%)
/guides/assets/images/logos/carbon.svg -- 22.07kb -> 21.71kb (1.63%)
/guides/assets/images/demo_search.gif -- 3,053.80kb -> 3,019.55kb (1.12%)
/guides/assets/images/dash-search-demo.gif -- 3,327.85kb -> 3,305.87kb (0.66%)
/guides/assets/images/logos/bnr-kyosan.gif -- 11.27kb -> 11.22kb (0.42%)
/guides/assets/images/check_bullet.svg -- 0.35kb -> 0.35kb (0.28%)

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