Update build iteration (2.3.1-3)
Update build iteration (2.3.1-3)

radykal-com/omnibus-graylog2,radykal-com/omnibus-graylog2,Graylog2/omnibus-graylog2,Graylog2/omnibus-graylog2,Graylog2/omnibus-graylog2,radykal-com/omnibus-graylog2,radykal-com/omnibus-graylog2,Graylog2/omnibus-graylog2