2.1.6

This release is the same as 2.1.5, with a fix to actually include the @nowarn annotation.

• #290 Add LazyList collection type (by @NthPortal and @yannbolliger)
• #303 Add Iterable#partitionMap operation (by @yannbolliger)
• #304 Add immutable.Queue#enqueueAll (by @hygt)
• #305, #307 Add iterable#lazyZip (by @pietrotull and @robstoll)
• #312 Add @nowarn annotation (though it has no effect on 2.11 and 2.12, except to allow cross-building)