upgrade scalachess to fix position hashes and threefold
upgrade scalachess to fix position hashes and threefold

clarkerubber/lila,luanlv/lila,clarkerubber/lila,clarkerubber/lila,clarkerubber/lila,luanlv/lila,luanlv/lila,luanlv/lila,arex1337/lila,arex1337/lila,clarkerubber/lila,luanlv/lila,clarkerubber/lila,arex1337/lila,arex1337/lila,clarkerubber/lila,arex1337/lila,arex1337/lila,luanlv/lila,luanlv/lila,arex1337/lila