Add tiszka@ to OWNERS

Change-Id: I9c4357ea970008d373b557e1c93e58f84c8e36b7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/deps/icu/+/5361289
Reviewed-by: Shu-yu Guo <syg@chromium.org>
1 file changed