On travis-ci, how do I encrypt my slack info while also setting on_start, etc -

when lint .travis.yml, told in notifications.slack section: unexpected key secure, dropping. if remove

on_start: never on_failure: on_success: change 

section, passes lint. how maintain these settings while still encrypting else?

https://lint.travis-ci.org/aaronjorbin/develop.wordpress

you can have on_start, etc parts long put secure under rooms ala

notifications:   slack:     rooms:       secure: wumcpfgrm0gidpbyzsgosakz5x7qibebwd+cphvxgkbl3zbqq+bvcdrnmiwzxjgf1vzg2de0taxcsmgkbxswce23nzkonmwpdib8xonwdv7t7zylgyd5s7p3gi6gv0l8y3/grodxfzap6vic1qrr4e79ow53rkk7e3wyoo7twqo=     on_start: never     on_failure:     on_success: change