If you’ve ridden a Divvy bike in Chicago, you have Brett A. August at least partially to thank.It was 2007, and in his role as chair of the Chicago-Paris Sister Cities Committee, part of Chicago Sister Cities International, August helped facilitate then-Mayor Richard M. Daley’s trip to Paris, serving as one of Daley’s liaisons.While there, the mayor grew smitten with “Vélib,” Paris’ bike-sharing program, a portmanteau of “vélo,” which means “bicycle,” and &ldquo …