Add rhalavati@ to clang_update watchlist.

Change-Id: I57a7aab0e1dead805863f974aca238d09aa3162d
Reviewed-on: https://chromium-review.googlesource.com/999487Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548737}

WATCHLISTS

@@ -1981,6 +1981,7 @@
                      'glider+clang@chromium.org',
                      'hans@chromium.org',
                      'pcc@chromium.org',
+                     'rhalavati@chromium.org',
                      'rnk@chromium.org',
                      'thakis@chromium.org',
                      'thestig@chromium.org',