Add plaree+watch@chromium.org to WATCHLISTS

BUG=NONE

Review URL: https://codereview.chromium.org/1003953007

Cr-Commit-Position: refs/heads/master@{#320743}

WATCHLISTS

@@ -1029,6 +1029,7 @@
     'sync': ['tim+watch@chromium.org',
              'maniscalco+watch@chromium.org',
              'maxbogue+watch@chromium.org',
+             'plaree+watch@chromium.org',
              'pvalenzuela+watch@chromium.org',
              'zea+watch@chromium.org'],
     'syncfs': ['kinuko+fileapi@chromium.org',