Merge branch 'bump-wp-compat' into 'master'

Bump WP compatibility

See merge request !5
3 jobs for v2.3.1 in 1 minute and 37 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
failed #6082
allowed to fail
PHPunit:PHP7.2:MySQL

00:01:09

failed #6083
allowed to fail
PHPunit:PHP7.3:MySQL

00:01:07

 
  Deploy
passed #6084
PluginSVN

00:00:27

 
Name Stage Failure
failed
PHPunit:PHP7.2:MySQL Test
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PHPunit:PHP7.3:MySQL Test
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