v5.0.0

If you are upgrading: please see UPGRADING.md.

Changed

• Breaking: bump rocksdb from 4.x to 5.x (a02f4b5) (Vincent Weevers)
• Breaking: bump level-packager from 5.x to 6.x (#73) (a0b5ea6) (Vincent Weevers)

Removed

• Breaking: drop Node.js 8 (Level/community#98) (ec94d45) (Vincent Weevers)
• Remove legacy range options from README (Level/community#86) (6d08202) (Vincent Weevers).