Automatic code cleanup.

PiperOrigin-RevId: 235005601
diff --git a/version.bzl b/version.bzl
index 4585d00..2eb6f5f 100644
--- a/version.bzl
+++ b/version.bzl
@@ -43,8 +43,7 @@
     attrs = {
         "template": attr.label(
             mandatory = True,
-            allow_files = True,
-            single_file = True,
+            allow_single_file = True,
         ),
         "out": attr.output(mandatory = True),
     },