gnu: Add go-github-com-go-md2man.

* gnu/packages/golang.scm (go-github-com-go-md2man): New variable.

gnu/packages/golang.scm

@@ -4,7 +4,7 @@
 ;;; Copyright © 2016 Andy Wingo <wingo@igalia.com>
 ;;; Copyright © 2016, 2019 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2016, 2017 Petter <petter@mykolab.ch>
-;;; Copyright © 2016, 2017, 2018, 2019 Leo Famulari <leo@famulari.name>
+;;; Copyright © 2016, 2017, 2018, 2019, 2020 Leo Famulari <leo@famulari.name>
 ;;; Copyright © 2017 Sergei Trofimovich <slyfox@inbox.ru>
 ;;; Copyright © 2017 Alex Vong <alexvong1995@gmail.com>
 ;;; Copyright © 2018 Tobias Geerinckx-Rice <me@tobias.gr>
@@ -2490,6 +2490,35 @@ (define-public go-github-com-urfave-cli
 fast and distributable command line applications in an expressive way.")
     (license license:expat)))
 
+(define-public go-github-com-go-md2man
+  (package
+    (name "go-github-com-go-md2man")
+    (version "2.0.0")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/cpuguy83/go-md2man")
+             (commit (string-append "v" version))))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32
+         "0r1f7v475dxxgzqci1mxfliwadcrk86ippflx9n411325l4g3ghv"))
+       (modules '((guix build utils)))
+       (snippet '(begin
+                   (delete-file-recursively "vendor")
+                   #t))))
+    (build-system go-build-system)
+    (arguments
+     '(#:import-path "github.com/cpuguy83/go-md2man"))
+    (propagated-inputs
+     `(("go-github-com-russross-blackfriday" ,go-github-com-russross-blackfriday)))
+    (home-page "https://github.com/cpuguy83/go-md2man")
+    (synopsis "Convert markdown into roff")
+    (description "Go-md2man is a Go program that converts markdown to roff for
+the purpose of building man pages.")
+    (license license:expat)))
+
 (define-public go-github-com-russross-blackfriday
   (package
     (name "go-github-com-russross-blackfriday")