release: bump version to 1.8.31 (development)

6 jobs for 1.8.31-dev in 17 minutes and 35 seconds (queued for 1 second)
latest
Status Name Job ID Coverage
  Build
passed fedora28_dist #779162

00:04:30

 
  Test
passed centos7 #779167

00:13:04

passed fedora_autotools_full #779166

00:09:45

passed fedora_autotools_minimal #779165

00:03:22

passed fedora_meson_full #779164

00:08:36

passed fedora_meson_minimal #779163

00:03:14