Make Tulsi app build rule public

This allows other repos to depend on this rule.

Closes #72.

PiperOrigin-RevId: 228602520
diff --git a/BUILD b/BUILD
index 44fd47a..9d4aaad 100644
--- a/BUILD
+++ b/BUILD
@@ -67,6 +67,7 @@
     minimum_os_version = "10.13",
     strings = [":strings"],
     version = ":AppVersion",
+    visibility = ["//visibility:public"],
     deps = [
         "//src/Tulsi:tulsi_lib",
     ],