[ImgBot] Optimize images

*Total -- 2,227.38kb -> 2,117.58kb (4.93%)

/issue-16/gif-16.gif -- 2,210.20kb -> 2,100.48kb (4.96%)
/issue-14/tagify.svg -- 11.85kb -> 11.78kb (0.55%)
/issue-16/svgbox.svg -- 5.33kb -> 5.31kb (0.42%)

Signed-off-by: ImgBotApp <ImgBotHelp@gmail.com>

Author: ImgBotApp