Slack swallows even more of your life with long-awaited feature

Slack is taking aim at the wheelhouse of one of its chief rivals with a new video-calling feature. The workplace chat service announced a hotly anticipated tool on Tuesday that will for the first time let co-workers chat face-to-face, in groups or individually, within the platform.  The move ups the competition between the company and Microsoft-owned competitor Skype for Work, which made its name in video conferencing, along with other services like Google Hangouts. It also follows rival Hi