Releasing 3.1

[abhi-zapr]

• Support for numeric, dimension & inverted topNmetric
• Support for movingAverage query
• Marking select query as deprecated since it has been removed in Druid version 0.17.0
• Support of automatic resource management for Client (AutoCloseable)
• Added expression support to some aggregators
• Support for limit in timeSeries query
• Support for stringFirst and stringLast aggregators
• Support for round in hyperUniqueAggregator
• Jackson databind version bump to 2.9.10.4