v2.0.0-rc1

Added

• Add Promise to the API if callbacks are omitted (@juliangruber)
• Add Greenkeeper badge (@ralphtheninja)
• Add tests for maybeError() calling back synchronously if db is closed (@ralphtheninja)

Changed

• Update deferred-leveldown to 2.0.0 (@ralphtheninja)
• Change levelup constructor to take store as first parameter (@ralphtheninja)
• Switch to use AbstractLevelDOWN#status (@ralphtheninja)
• Update copyright year to 2017 (@ralphtheninja)
• Rename lib/util.js to lib/promisify.js (@ralphtheninja)

Removed

• Remove approximateSize() (@ralphtheninja)
• Remove destroy() (@ralphtheninja)
• Remove repair() (@ralphtheninja)
• Remove getProperty() (@ralphtheninja)
• Remove .errorIfExists (@ralphtheninja)
• Remove .createIfMissing (@ralphtheninja)
• Remove .compression (@ralphtheninja)
• Remove .cacheSize (@ralphtheninja)
• Remove .sync (@ralphtheninja)
• Remove .fillCache (@ralphtheninja)
• Remove optional leveldown (@ralphtheninja)
• Remove unused options parameter from maybeError (@ralphtheninja)
• Remove browser field from package.json (@ralphtheninja)
• Remove 0.12 and 4 from Travis (@juliangruber)
• Remove unused isDefined from lib/util.js (@ralphtheninja)
• Remove encodings (@ralphtheninja)
• Remove dispatchError(), callback is always a function (@ralphtheninja)

Fixed

• Fix problems with zalgo in maybeError() (@ralphtheninja)