gnu: emacs-es-mode: Don't use unstable tarball.

* gnu/packages/emacs-xyz.scm (emacs-es-mode)[source]: Use GIT-FETCH and
GIT-FILE-NAME.

gnu/packages/emacs-xyz.scm

@@ -2175,15 +2175,15 @@ port of @code{cl-spark} to Emacs Lisp.")
   (package
     (name "emacs-es-mode")
     (version "4.3.0")
-    (source (origin
-              (method url-fetch)
-              (uri (string-append
-                    "https://github.com/dakrone/es-mode/archive/"
-                    version ".tar.gz"))
-              (file-name (string-append name "-" version ".tar.gz"))
-              (sha256
-               (base32
-                "0y86qdcb3g7fkcb4pzsjh3syzql6w3314hg1wqxq4a8bbk3y0cgr"))))
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/dakrone/es-mode.git")
+             (commit version)))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32 "1qhfnd5anp5qrmravv7ks5ix763xnki2f5jwcyj70qyxwr0l60cg"))))
     (build-system emacs-build-system)
     (propagated-inputs
      ;; The version of org in Emacs 24.5 is not sufficient, and causes tables