Two weeks ago Flow 4.2.1 and 4.2.2 have been released.
Last Friday (every release except 4.0.13) and today (4.0.13) a number of more bugfix releases have been tagged. All fix a small number of bugs and inconveniences, as is to be expected.
Flow - 4.2.1 ChangeLog
Flow - 4.2.2 ChangeLog
Flow - 4.2.3 ChangeLog
Flow - 4.1.7 ChangeLog
Flow - 4.0.13 ChangeLog (RTD still pending)
Flow - 3.3.19 ChangeLog