snowballstemmer: upgraded package to upstream

Upgraded dev-python/snowballstemmer to version 2.0.0 on amd64, arm

It's needed by sphinx.

BUG=chromium:999876
TEST=update_chroot

Change-Id: Icaa452d7a360af77691e50b90070a813eaa0ae7b
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/2219763
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Yilin Yang (kerker) <kerker@chromium.org>
Tested-by: Yilin Yang (kerker) <kerker@chromium.org>
4 files changed