rosenthal: Add go-github-com-dgryski-go-rendezvous.

* rosenthal/packages/golang.scm (go-github-com-dgryski-go-rendezvous): New
variable.

rosenthal/packages/golang.scm

@@ -32,6 +32,27 @@
 @url{https://cyan4973.github.io/xxHash/,xxHash} algorithm, XXH64.")
     (license license:expat)))
 
+(define-public go-github-com-dgryski-go-rendezvous
+  (package
+    (name "go-github-com-dgryski-go-rendezvous")
+    (version "0.0.0-20200823014737-9f7001d12a5f")
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                    (url "https://github.com/dgryski/go-rendezvous")
+                    (commit (go-version->git-ref version))))
+              (file-name (git-file-name name version))
+              (sha256
+               (base32
+                "0hhdbsm5k19kh1fyxs4aibza9jylils4p3555lr8xalhj2iz3zlz"))))
+    (build-system go-build-system)
+    (arguments
+     '(#:import-path "github.com/dgryski/go-rendezvous"))
+    (home-page "https://github.com/dgryski/go-rendezvous")
+    (synopsis "Rendezvous hashing for Go")
+    (description "This package provides a Go rendezvous hashing library.")
+    (license license:expat)))
+
 (define-public go-github-com-gin-contrib-sse
   (package
     (name "go-github-com-gin-contrib-sse")