Release v4.0.0

Breaking

• Since many dependencies were updated to higher major versions, this package should now require at least Node 8
• The structure of URLs when querying in Items view is now different so if you have bookmarked URLs pointing to specific queries, those will likely no longer work.

Feature

• Added support for scanning and querying indexes and some query operators (#90) (thanks @benhutchins)
• Added API for fetching all tables (#84) (thanks @afshawnlotfi)

Fix

• Forward dynamo errors on listing items to the UI

Maintenance

• Update all dependencies