Use new-style date in changelog (with TZ) for Fedora

Signed-off-by: Igor Gnatenko <ignatenkobrain@fedoraproject.org>

rust2rpm/__main__.py

@@ -291,7 +291,7 @@ def main():
     else:
         kwargs["pkg_release"] = "1%{?dist}"
 
-    if args.target == "opensuse":
+    if args.target in {"opensuse", "fedora"}:
         kwargs["date"] = time.strftime("%a %b %d %T %Z %Y")
     else:
         kwargs["date"] = time.strftime("%a %b %d %Y")