gnu: Add julia-missings.

* gnu/packages/julia-xyz.scm (julia-missings-0.4.3): New variable.

gnu/packages/julia-xyz.scm

@@ -539,3 +539,24 @@ without having to take direct dependencies.")
 interface functions for working with all kinds tabular data through
 predictable access patterns.")
     (license license:expat)))
+
+(define-public julia-missings
+  (package
+    (name "julia-missings")
+    (version "0.4.3")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/JuliaData/Missings.jl")
+             (commit (string-append "v" version))))
+       (file-name "Missings")
+       (sha256
+        (base32 "1y77c9kml708hp3hq0w7yv6qfd2s53s1108bbpfb841y5nrwxnk8"))))
+    (propagated-inputs `(("julia-dataapi" ,julia-dataapi)))
+    (build-system julia-build-system)
+    (home-page "https://github.com/JuliaData/Missings.jl")
+    (synopsis "Missing value support for Julia")
+    (description "Convenience functions for working with missing values in
+Julia.")
+    (license license:expat)))