gnu: emacs-diff-hl: Update to 1.8.6.

* gnu/packages/emacs-xyz.scm (emacs-diff-hl): Update to 1.8.6.
[source]: Fetch from git.

Signed-off-by: Ricardo Wurmus <rekado@elephly.net>

gnu/packages/emacs-xyz.scm

@@ -7075,15 +7075,16 @@ (define-public emacs-adaptive-wrap
 (define-public emacs-diff-hl
   (package
     (name "emacs-diff-hl")
-  (version "1.8.5")
+    (version "1.8.6")
     (source
      (origin
-      (method url-fetch)
-      (uri (string-append "https://elpa.gnu.org/packages/diff-hl-"
-                          version ".tar"))
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/dgutov/diff-hl")
+             (commit version)))
        (sha256
         (base32
-          "1vxc7z7c2qs0mx7l5sa4sybi5qbzv0s79flj74p1ynw8dl3qxg3d"))))
+         "1xlsg728mz3cwhrsqvisa0aidic67nymd9g7h4c1h3q63j39yb2s"))))
     (build-system emacs-build-system)
     (home-page "https://github.com/dgutov/diff-hl")
     (synopsis