add myself to watchlist

Review URL: http://codereview.chromium.org/6757013

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@79597 0039d316-1c4b-4281-b951-d872f2087c98

WATCHLISTS

@@ -18,7 +18,7 @@
 
   'WATCHLISTS': {
     'this_file': ['nirnimesh@chromium.org'],
-    'depot_tools': ['maruel@chromium.org'],
+    'depot_tools': ['maruel@chromium.org', 'dpranke@chromium.org'],
   },
 
 }