Jepsen: MongoDB 4.2.6

- Kyle Kingsbury tl;dr: "Jepsen evaluated MongoDB version 4.2.6, and found that even at the strongest levels of read and write concern, it failed to preserve snapshot isolation." A thorough analysis. 

featured in #183

Was MongoDB Ever the Right Choice?

- Justin Etheredge tl;dr: MongoDB's rapid rise resulted in many implementing it without proper evaluation. This article asks decision makers to know the answers to two questions when considering new tools 🔧 - what problems am I trying to solve and what am I giving up?

featured in #134