Ignore bluebird in depcheck
Ignore bluebird in depcheck

any-promise requires a promise module for Node versions which lack
global Promise (v0.10).  bluebird is the one included.

Signed-off-by: Kevin Locke <ffb4761cba839470133bee36aeb139f58d7dbaa9@kevinlocke.name>

kevinoid/travis-status,kevinoid/travis-status,kevinoid/travis-status