FSharpPlus 1.6.1

• Add Non-sequential-Applicative operators and computation expressions
• Add proper SeqT implementation
• Matrix and Vector types implement IEnumerable's and IReadOnly's interfaces
• Add limited applicative support to dictionaries
• Add (forward) tee operator (|-)
• Add "mapsquared" pipe operators (|>>>) and (<<<|)
• Add some functions, interfaces and optimizations to DList<'T>
• Add findLastSliceIndex and tryFindLastSliceIndex
• Add Result.Sequence
• Add Result.iterError
• Add Validation.ofOptionWith
• Add List.chunkBy
• Rename Sequence overloads to Sequential
• Add Async.Await Async.AsTask and more overloads to Async.Sequential
• Add empty and isEmpty to IReadOnlyCollection and Exception module
• Fix bug in lift3 for List and Array
• Type inference for generic traversals slightly improved