Merge pull request #236 from fsprojects/implement-insertat-removeat-updateat

Implement `TaskSeq.insertAt`, `updateAt`, `removeAt`, `insertManyAt`, `removeManyAt`

Author: abelbraaksma

src/FSharp.Control.TaskSeq.Test/FSharp.Control.TaskSeq.Test.fsproj

@@ -27,6 +27,7 @@
     <Compile Include="TaskSeq.Head.Tests.fs" />
     <Compile Include="TaskSeq.Indexed.Tests.fs" />
     <Compile Include="TaskSeq.Init.Tests.fs" />
+    <Compile Include="TaskSeq.InsertAt.Tests.fs" />
     <Compile Include="TaskSeq.IsEmpty.fs" />
     <Compile Include="TaskSeq.Item.Tests.fs" />
     <Compile Include="TaskSeq.Iter.Tests.fs" />
@@ -36,13 +37,15 @@
     <Compile Include="TaskSeq.MaxMin.Tests.fs" />
     <Compile Include="TaskSeq.OfXXX.Tests.fs" />
     <Compile Include="TaskSeq.Pick.Tests.fs" />
+    <Compile Include="TaskSeq.RemoveAt.Tests.fs" />
     <Compile Include="TaskSeq.Singleton.Tests.fs" />
     <Compile Include="TaskSeq.Skip.Tests.fs" />
     <Compile Include="TaskSeq.SkipWhile.Tests.fs" />
     <Compile Include="TaskSeq.Tail.Tests.fs" />
     <Compile Include="TaskSeq.Take.Tests.fs" />
     <Compile Include="TaskSeq.TakeWhile.Tests.fs" />
     <Compile Include="TaskSeq.ToXXX.Tests.fs" />
+    <Compile Include="TaskSeq.UpdateAt.Tests.fs" />
     <Compile Include="TaskSeq.Zip.Tests.fs" />
     <Compile Include="TaskSeq.Tests.CE.fs" />
     <Compile Include="TaskSeq.StateTransitionBug.Tests.CE.fs" />