gnu: Add julia-itertools.

* gnu/packages/julia-xyz.scm (julia-itertools-1.2.0): New variable.

gnu/packages/julia-xyz.scm

@@ -1325,3 +1325,23 @@ operations.  Note that here \"statically sized\" means that the size can be
 determined from the type, and \"static\" does not necessarily imply
 immutable.")
     (license license:expat)))
+
+(define-public julia-itertools
+  (package
+    (name "julia-itertools")
+    (version "1.2.0")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/JuliaCollections/IterTools.jl")
+             (commit (string-append "v" version))))
+       (file-name "IterTools")
+       (sha256
+        (base32 "1iq08xpj1gb2wz2hx7g177clxnxcwlma12dj240xnk7q0g623hbv"))))
+    (build-system julia-build-system)
+    (home-page "https://juliacollections.github.io/IterTools.jl/stable/")
+    (synopsis "Common functional iterator patterns")
+    (description "This Julia package provides common functional iterator
+patterns like @code{nth}, @code{takenth}, @code{groupby}.")
+    (license license:expat)))