gnu: emacs-minitest: Switch source to the git repository.

The 0.8.0 release was over 3 years ago, and there have been ~50 commits since.

* gnu/packages/emacs.scm (emacs-minitest): Wrap with let, and change source to
the git repository.

gnu/packages/emacs.scm

@@ -1828,18 +1828,20 @@ of files under Git version control from within Emacs.")
     (license license:gpl3+)))
 
 (define-public emacs-minitest
+  (let ((commit "1aadb7865c1dc69c201cecee275751ecec33a182")
+        (revision "1"))
     (package
       (name "emacs-minitest")
-    (version "0.8.0")
+      (version (git-version "0.8.0" revision commit))
       (source (origin
-             (method url-fetch)
-             (uri (string-append
-                   "https://github.com/arthurnn/minitest-emacs/archive/v"
-                   version ".tar.gz"))
-             (file-name (string-append name "-" version ".tar.gz"))
+                (method git-fetch)
+                (uri (git-reference
+                      (url "https://github.com/arthurnn/minitest-emacs")
+                      (commit commit)))
+                (file-name (git-file-name name commit))
                 (sha256
                  (base32
-               "1dsb7kzvs1x6g4sgqmq73jqacb7wzm0wfkiq5m9dqdzq8mppgiqs"))))
+                  "1l18zqpdzbnqj2qawq8hj7z7pl8hr8z9d8ihy8jaiqma915hmhj1"))))
       (build-system emacs-build-system)
       (arguments
        '(#:include (cons "^snippets\\/minitest-mode\\/" %default-include)
@@ -1855,7 +1857,7 @@ file or line, as well as rerunning the previous tests, or all the tests for a
 project.
 
 This package also includes relevant snippets for yasnippet.")
-    (license license:expat)))
+      (license license:expat))))
 
 (define-public emacs-el-mock
   (package