gnu: Add go-github-com-docker-go-units.

* gnu/packages/golang.scm (go-github-com-docker-go-units): New variable.

gnu/packages/golang.scm

@@ -3892,6 +3892,28 @@ the Go language.  In particular it provides tools to deal with network address
 translation (NAT), proxies, sockets, and transport layer security (TLS).")
       (license license:asl2.0))))
 
+(define-public go-github-com-docker-go-units
+  (package
+    (name "go-github-com-docker-go-units")
+    (version "0.4.0")
+    (source
+      (origin
+        (method git-fetch)
+        (uri (git-reference
+               (url "https://github.com/docker/go-units")
+               (commit (string-append "v" version))))
+        (file-name (git-file-name name version))
+        (sha256
+         (base32 "0k8gja8ql4pqg5rzmqvka42vjfs6rzablak87whcnqba6qxpimvz"))))
+    (build-system go-build-system)
+    (arguments '(#:import-path "github.com/docker/go-units"))
+    (home-page "https://github.com/docker/go-units")
+    (synopsis "Parse and print size and time units in human-readable format")
+    (description
+     "@code{go-units} is a library to transform human friendly measurements into
+machine friendly values.")
+    (license license:asl2.0)))
+
 (define-public go-github-com-docker-machine
   (let ((commit "7b7a141da84480342357c51838be142bf183b095")
         (revision "0"))