gnu: go-gopkg-in-yaml-v2: Update to 2.2.2.

* gnu/packages/golang.scm (go-gopkg-in-yaml-v2): Update to 2.2.2.

gnu/packages/golang.scm

@@ -1956,21 +1956,19 @@ (define-public go-gopkg-in-check-v1
       (license license:asl2.0))))
 
 (define-public go-gopkg-in-yaml-v2
-  (let ((commit "14227de293ca979cf205cd88769fe71ed96a97e2")
-        (revision "0"))
   (package
     (name "go-gopkg-in-yaml-v2")
-      (version (git-version "0.0.0" revision commit))
+    (version "2.2.2")
     (source
       (origin
         (method git-fetch)
         (uri (git-reference
                (url "https://gopkg.in/yaml.v2.git")
-                 (commit commit)))
+               (commit (string-append "v" version))))
         (file-name (git-file-name name version))
         (sha256
          (base32
-              "038hnrjcnjygyi3qidfrkpkakis82qg381sr495d2s40g2dwlzah"))))
+          "01wj12jzsdqlnidpyjssmj0r4yavlqy7dwrg7adqd8dicjc4ncsa"))))
     (build-system go-build-system)
     (arguments
      '(#:import-path "gopkg.in/yaml.v2"))
@@ -1981,7 +1979,7 @@ (define-public go-gopkg-in-yaml-v2
     (description
      "This package provides a Go library for encode and decode YAML
 values.")
-      (license license:asl2.0))))
+    (license license:asl2.0)))
 
 (define-public go-github-com-mattn-go-isatty
   (package