The big winner of Uber's $2.65 billion Postmates acquisition is Spark Capital, a small VC firm that's enjoying a streak of hits in a gloomy 2020.

· Spark Capital was one of the big winners when Uber announced its acquisition of restaurant service Postmates for $2.6 billion on Monday.
· The venture capital firm has invested in other major hitters in the startup world, including Slack, Plaid, and Mirror, the fitness tech startup that was sold to Lululemon for $500...