Travis CI: Disable integration[ldap-ubuntu-1604,verify] with Ruby 2.3
Travis CI: Disable integration[ldap-ubuntu-1604,verify] with Ruby 2.3

zuazo/dovecot-cookbook,zuazo/dovecot-cookbook,onddo/dovecot-cookbook,onddo/dovecot-cookbook,onddo/dovecot-cookbook,zuazo/dovecot-cookbook