Add dtseng@chromium.org to chromevox watchlist

TBR=akihiroota@chromium.org

Change-Id: Iebe61b27eddcf7fb9261e741f211c5795842ae28
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1923030
Commit-Queue: David Tseng <dtseng@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#716404}

WATCHLISTS

@@ -2297,7 +2297,7 @@
                            'khorimoto+watch@chromium.org',
                            'stevenjb+watch@chromium.org',
                            'vecore+watch@google.com'],
-    'chromevox': ['anastasi+watch@google.com'],
+    'chromevox': ['anastasi+watch@google.com', 'dtseng+chromevox@chromium.org'],
     'clang_update': ['dcheng@chromium.org',
                      'eugenis+clang@chromium.org',
                      'gbiv+clang@chromium.org',