v1.2.0

Changed

• Upgrade level-packager from ~1.0.0 to ~1.2.0 (@ralphtheninja)
• Upgrade tape devDependency from ~4.0.0 to ^4.2.2 (@ralphtheninja)

Added

• Add dependency badge (@ralphtheninja)
• Add node 4 and 5 to Travis (@ralphtheninja)
• Add iojs 1.0, 2 and 3 to Travis (@ralphtheninja)