bump to 0.4.2 and force 2.5.11 (#579)

4 jobs for v0.4.2-beta in 19 minutes and 51 seconds (queued for 34 seconds)
latest
Status Job ID Name Coverage
  Test
passed #324706
linux-docker
linux-test

00:02:07

 
  Build
passed #324707
linux-docker
linux-build

00:09:25

passed #324708
darwin-shell
osx-build

00:06:23

passed #324709
linux-docker
win-build

00:08:17