gnu: go-github.com-smartystreets-assertions: Update to 1.13.0.

* gnu/packages/check.scm (go-github.com-smartystreets-assertions):
Update to 1.13.0.

gnu/packages/check.scm

@@ -665,16 +665,15 @@ test) much simpler.")
 (define-public go-github.com-smartystreets-assertions
   (package
     (name "go-github.com-smartystreets-assertions")
-    (version "1.8.1")
+    (version "1.13.0")
     (source (origin
               (method git-fetch)
               (uri (git-reference
                     (url "https://github.com/smartystreets/assertions")
-                    (commit version)))
+                    (commit (string-append "v" version))))
               (file-name (git-file-name name version))
               (sha256
-               (base32
-                "1j0adgbykl55rf2945g0n5bmqdsnjcqlx5dcmpfh4chki43hiwg9"))))
+               (base32 "0flf3fb6fsw3bk1viva0fzrzw87djaj1mqvrx2gzg1ssn7xzfrzr"))))
     (build-system go-build-system)
     (arguments
      '(#:import-path "github.com/smartystreets/assertions"))