gnu: Add elixir-excoveralls.

* gnu/packages/elixir-xyz.scm (elixir-excoveralls): New variable.

Change-Id: Ib271d8a7393e21178806df28ab892afe99757297
Signed-off-by: Liliana Marie Prikler <liliana.prikler@gmail.com>

gnu/packages/elixir-xyz.scm

@@ -182,6 +182,28 @@ an up-to-date CA certificate store file for Elixir applications.")
     (home-page "https://hexdocs.pm/castore/")
     (license license:asl2.0)))
 
+(define-public elixir-excoveralls
+  (package
+    (name "elixir-excoveralls")
+    (version "0.18.0")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (hexpm-uri name version))
+       (sha256
+        (base32 "02x69ll5scvraky0k5gacvnnmldv5k04kgk02x087d9w3y8vn28i"))))
+    (build-system mix-build-system)
+    (propagated-inputs (list elixir-castore elixir-jason))
+    (arguments (list #:tests? #f)) ; no tests
+    (synopsis "Coverage report tool with coveralls.io integration")
+    (description
+     "Library that reports test coverage statistics, with the option to
+post to coveralls.io service. It uses Erlang's cover to generate coverage
+information, and posts the test coverage results to coveralls.io through the
+JSON API.")
+    (home-page "https://hexdocs.pm/excoveralls/")
+    (license license:expat)))
+
 ;;;
 ;;; Avoid adding new packages to the end of this file. To reduce the chances
 ;;; of a merge conflict, place them above by existing packages with similar