fix license

BUILD

diff --git a/BUILD b/BUILD
index e2c2f41..e1fa0e2 100644
--- a/BUILD
+++ b/BUILD
@@ -3,6 +3,7 @@
 license(
     name = "license",
     package_name = "rules_proto",
+    license_kinds = ["@rules_license//licenses/spdx:Apache-2.0"],
 )
 
 licenses(["notice"])