gnu: python-biom-format: Fetch source from git.

* gnu/packages/bioinformatics.scm (python-biom-format)[source]: Fetch from
git.

gnu/packages/bioinformatics.scm

@@ -694,15 +694,16 @@ Python.")
     (version "2.1.6")
     (source
      (origin
-     (method url-fetch)
+       (method git-fetch)
        ;; Use GitHub as source because PyPI distribution does not contain
        ;; test data: https://github.com/biocore/biom-format/issues/693
-     (uri (string-append "https://github.com/biocore/biom-format/archive/"
-                         version ".tar.gz"))
-     (file-name (string-append name "-" version ".tar.gz"))
+       (uri (git-reference
+             (url "https://github.com/biocore/biom-format.git")
+             (commit version)))
+       (file-name (git-file-name name version))
        (sha256
         (base32
-       "08cr7wpahk6zb31h4bs7jmzpvxcqv9s13xz40h6y2h656jvdvnpj"))))
+         "00yi8hkj3n7vdz8p8x93bi810f7cpm8rb0dd3kfhr2cpbmd2rsql"))))
     (build-system python-build-system)
     (propagated-inputs
      `(("python-numpy" ,python-numpy)