gnu: go-github-com-ccding-go-stun: Update version string.

The commit was also tagged 0.1.1.

* gnu/packages/syncthing.scm (go-github-com-ccding-go-stun)[version]:
Change to tagged version.
[source]: Update to use version string.

gnu/packages/syncthing.scm

@@ -1035,29 +1035,27 @@ virtual connections from a single physical connection.")
     (license expat)))
 
 (define-public go-github-com-ccding-go-stun
-  (let ((commit "be486d185f3dfcb2dbf8429332da50a0da7f95a6")
-        (revision "2"))
-    (package
-      (name "go-github-com-ccding-go-stun")
-      (version (git-version "0.0.0" revision commit))
-      (source
-        (origin
-          (method git-fetch)
-          (uri (git-reference
-                 (url "https://github.com/ccding/go-stun.git")
-                 (commit commit)))
-          (file-name (git-file-name name version))
-          (sha256
-           (base32
-            "1gr0rw1c1y7wh6913lyn5k4ig023by27i36bly6am8dwgrgp34ww"))))
-      (build-system go-build-system)
-      (arguments
-       '(#:import-path "github.com/ccding/go-stun"))
-      (synopsis "STUN client implementation")
-      (description "Go-stun is a go implementation of the STUN client (RFC 3489
+  (package
+    (name "go-github-com-ccding-go-stun")
+    (version "0.1.1")
+    (source
+      (origin
+        (method git-fetch)
+        (uri (git-reference
+               (url "https://github.com/ccding/go-stun.git")
+               (commit (string-append "v" version))))
+        (file-name (git-file-name name version))
+        (sha256
+         (base32
+          "1gr0rw1c1y7wh6913lyn5k4ig023by27i36bly6am8dwgrgp34ww"))))
+    (build-system go-build-system)
+    (arguments
+     '(#:import-path "github.com/ccding/go-stun"))
+    (synopsis "STUN client implementation")
+    (description "Go-stun is a go implementation of the STUN client (RFC 3489
 and RFC 5389).")
-      (home-page "https://github.com/ccding/go-stun")
-      (license asl2.0))))
+    (home-page "https://github.com/ccding/go-stun")
+    (license asl2.0)))
 
 (define-public go-github-com-cespare-xxhash
   (package