[ImgBot] Optimize images

*Total -- 228.58kb -> 128.71kb (43.69%)

/docs/.vuepress/public/images/screen-shot-2018-05-23-at-4.02.40-pm.png -- 156.43kb -> 85.39kb (45.41%)
/docs/.vuepress/public/images/vuejsradar.png -- 72.15kb -> 43.31kb (39.97%)

Author: ImgBotApp