gnu: emacs-know-your-http-well: Don't use unstable tarball.

* gnu/packages/emacs-xyz.scm (emacs-know-your-http-well)[source]: Use GIT-FETCH and
GIT-FILE-NAME.

gnu/packages/emacs-xyz.scm

@@ -10404,14 +10404,13 @@ buffer.")
     (version "0.5.0")
     (source
      (origin
-       (method url-fetch)
-       (uri (string-append
-             "https://github.com/for-GET/know-your-http-well/archive/"
-             "v" version ".tar.gz"))
-       (file-name (string-append name "-" version ".tar.gz"))
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/for-GET/know-your-http-well.git")
+             (commit (string-append "v" version))))
+       (file-name (git-file-name name version))
        (sha256
-        (base32
-         "1y3kwz88awcgwaivlswq0q4g2i02762r23lpwg61bfqy5lrjjqnj"))))
+        (base32 "1lppggnii2r9fvlhh33gbdrwb50za8lnalavlq9s86ngndn4n94k"))))
     (arguments
      `(#:phases
        (modify-phases %standard-phases