fix replication always use write host
Merge pull request #2650 from Tradesparq/fix-replication

fix replication always use write host
Update dependencies

This commit updates bluebird, sql and validator. The latter one is
reported to be vulnerable:
https://nodesecurity.io/advisories/validator-isurl-denial-of-service
Merge pull request #2615 from sequelize/hotfix/update-dependencies

Update dependencies
Merge remote-tracking branch 'upstream/master'