List Bowen Ni as a contributor.

I co-authored Tsetse.

PiperOrigin-RevId: 177336318
diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index 909f21e..891139e 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -11,5 +11,6 @@
 
 Andrew Allen <achew22@gmail.com>
 Alex Eagle <alexeagle@google.com>
+Bowen Ni <bowen1897@gmail.com>
 Daniel Muller <mrmeku@gmail.com>
 Martin Probst <martin@probst.io>