3.0 release (Oct. 2012): https://news.ycombinator.com/item?id=4687455
4.0 release (Dec. 2012): https://news.ycombinator.com/item?id=4959417
5.0 release (Mar. 2013): https://news.ycombinator.com/item?id=5422950
6.0 release (Aug. 2013): https://news.ycombinator.com/item?id=6270446