Force at least the Istanbul release (#578)

4 jobs for v0.4.1-beta in 2 minutes and 40 seconds (queued for 6 minutes and 10 seconds)
latest
Status Job ID Name Coverage
  Test
failed #316805
linux-docker
linux-test

00:02:40

 
  Build
skipped #316806
linux-docker
linux-build
skipped #316807
darwin-shell
osx-build
skipped #316808
linux-docker
win-build
 
Name Stage Failure
failed
linux-test Test
  type: 'system',
errno: 'EAI_AGAIN',
code: 'EAI_AGAIN'
}
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this command.
ERROR: Job failed: exit code 1