v2.6.3

Added

• Add GreenKeeper (@ralphtheninja)
• Test key/value serialization (@bigeasy)
• Test undefined value serializing to empty string (@ralphtheninja)

Changed

• Update dependencies (@ralphtheninja)
• Convert nullish values to empty strings (@bigeasy)
• Use t.equal(a, b) instead of t.ok(a === b) (@bigeasy)
• Relax tests for serializing object in abstract/chained-batch-test.js (@ralphtheninja)

Fixed

• Document .status property (@ralphtheninja)