Remove 'ROC' from all_timezones. See

https://mm.icann.org/pipermail/tz/2001-March/011492.html for details

--- pytz-2016.4/pytz/__init__.py.~2~ 2016-05-19 13:00:36.852619160 -0700

+++ pytz-2016.4/pytz/__init__.py 2016-05-19 13:00:52.244751240 -0700

@@ -1056,7 +1056,6 @@

'Pacific/Yap',

'Poland',

'Portugal',

- 'ROC',

'ROK',

'Singapore',

'Turkey',