Add MODULE file to the release.

BUILD

diff --git a/BUILD b/BUILD
index 8401117..1daa47d 100644
--- a/BUILD
+++ b/BUILD
@@ -8,6 +8,7 @@
         "AUTHORS",
         "BUILD",
         "LICENSE",
+        "MODULE.bazel",
         "//java:srcs",
         "//toolchains:srcs",
     ],