Add tandrii@ to watcher of git_cl.py changes.

Reason: so I can not lgtm/revert anything which doesn't come with
more tests.

R=iannucci@chromium.org,dpranke@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1873403004

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@299921 0039d316-1c4b-4281-b951-d872f2087c98

WATCHLISTS

@@ -8,6 +8,9 @@
 {
 
   'WATCHLIST_DEFINITIONS': {
+    'git_cl.py': {
+      'filepath': 'git_cl.py',
+    },
     'this_file': {
       'filepath': '^WATCHLISTS$',
     },
@@ -18,6 +21,9 @@
 
   'WATCHLISTS': {
     'this_file': [],
+    'git_cl.py': [
+      'tandrii+omg_git_cl@chromium.org',
+    ],
     'depot_tools': [
       'dpranke+depot_tools@chromium.org',
       'iannucci+depot_tools@chromium.org',