gnu: go-github-com-stretchr-testify: Update to 1.5.1.

* gnu/packages/golang.scm (go-github-com-stretchr-testify):
  Update to 1.5.1.

gnu/packages/golang.scm

@@ -941,28 +941,30 @@ slices, JSON and other data.")
     (license license:expat)))
 
 (define-public go-github-com-stretchr-testify
-  (let ((commit
-          "b1f989447a57594c728884458a39abf3a73447f7")
-        (revision "0"))
-    (package
-      (name "go-github-com-stretchr-testify")
-      (version (git-version "1.1.4" revision commit))
-      (source
-        (origin
-          (method git-fetch)
-          (uri (git-reference
-                 (url "https://github.com/stretchr/testify.git")
-                 (commit commit)))
-          (file-name (git-file-name name version))
-          (sha256
-            (base32
-              "0p0gkqzh2p8r5g0rxm885ljl7ghih7h7hx9w562imx5ka0vdgixv"))))
-      (build-system go-build-system)
-      (arguments
-        '(#:import-path "github.com/stretchr/testify"))
-      (home-page "https://github.com/stretchr/testify")
-      (synopsis "Go helper library for tests and invariant checking")
-      (description "This package provide many tools for testifying that your
+  (package
+    (name "go-github-com-stretchr-testify")
+    (version "1.5.1")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/stretchr/testify.git")
+             (commit (string-append "v" version))))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32
+         "09r89m1wy4cjv2nps1ykp00qjpi0531r07q3s34hr7m6njk4srkl"))))
+    (build-system go-build-system)
+    (arguments
+     '(#:import-path "github.com/stretchr/testify"))
+    (propagated-inputs
+     `(("github.com/davecgh/go-spew" ,go-github-com-davecgh-go-spew)
+       ("github.com/pmezard/go-difflib" ,go-github-com-pmezard-go-difflib)
+       ("github.com/stretchr/objx" ,go-github-com-stretchr-objx)
+       ("gopkg.in/yaml.v2" ,go-gopkg-in-yaml-v2)))
+    (home-page "https://github.com/stretchr/testify")
+    (synopsis "Go helper library for tests and invariant checking")
+    (description "This package provide many tools for testifying that your
 code will behave as you intend.
 
 Features include:
@@ -972,7 +974,7 @@ Features include:
 @item HTTP response trapping
 @item Testing suite interfaces and functions.
 @end itemize")
-      (license license:expat))))
+    (license license:expat)))
 
 (define-public go-github-com-tevino-abool
   (let ((commit