rosenthal: Add go-github-com-go-playground-assert-v2.

* rosenthal/packages/golang.scm (go-github-com-go-playground-assert-v2): New
variable.

rosenthal/packages/golang.scm

@@ -33,6 +33,29 @@
      "This package provides a Server-Sent Events implementation in Go.")
     (license license:expat)))
 
+(define-public go-github-com-go-playground-assert-v2
+  (package
+    (name "go-github-com-go-playground-assert-v2")
+    (version "2.0.1")
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                    (url "https://github.com/go-playground/assert")
+                    (commit (string-append "v" version))))
+              (file-name (git-file-name name version))
+              (sha256
+               (base32
+                "1cl9c4s405zddzrj36hhs0a18g02zscdl46fyipp6k91mhvai8wz"))))
+    (build-system go-build-system)
+    (arguments
+     '(#:import-path "github.com/go-playground/assert/v2"))
+    (home-page "https://github.com/go-playground/assert")
+    (synopsis "Basic assertion library used along side native Go testing")
+    (description
+     "This package provides a basic assertion library used along side native
+Go testing, with building blocks for custom assertions.")
+    (license license:expat)))
+
 (define-public go-github-com-google-gopacket
   (package
     (name "go-github-com-google-gopacket")