gnu: Add erlang-yamerl.

* gnu/packages/erlang.scm (erlang-yamerl): New variable.

Signed-off-by: Christopher Baines <mail@cbaines.net>

gnu/packages/erlang.scm

@@ -281,6 +281,28 @@ Mozilla's canonical set.")
 printing extending the io:format syntax to add colours.")
     (license license:expat)))
 
+(define-public erlang-yamerl
+  (package
+    (name "erlang-yamerl")
+    (version "0.10.0")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             ;; There are no tests included on Hex.
+             (url "https://github.com/yakaz/yamerl")
+             (commit (string-append "v" version))))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32 "0if8abgmispcfk7zhd0a5dndzwzbsmqrbyrm5shk375r2dbbwak6"))))
+    (build-system rebar-build-system)
+    (synopsis "YAML and JSON parser in pure Erlang")
+    (description
+     "Erlang application to parse YAML 1.1 and YAML 1.2 documents, as well as
+JSON documents.")
+    (home-page "https://hexdocs.pm/yamerl/")
+    (license license:bsd-2)))
+
 (define-public erlang-covertool
   (package
     (name "erlang-covertool")