Update README.md

Author: abelbraaksma

README.md

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 # TaskSeq
-An implementation IAsyncEnumerable<'T> as a taskSeq CE for F# with accompanying TaskSeq module
+An implementation `IAsyncEnumerableM<'T>` as a `taskSeq` CE for F# with accompanying `TaskSeq` module.
+
+## Coming up!!! 
+
+It's based on [Don Symes `taskSeq.fs`](https://github.com/dotnet/fsharp/blob/d5312aae8aad650f0043f055bb14c3aa8117e12e/tests/benchmarks/CompiledCodeBenchmarks/TaskPerf/TaskPerf/taskSeq.fs) but expanded with useful utility functions and a few extra binding overloads.