update to tskit 1.0.0 etc. #566
Description
The next SLiM release should update to tskit 1.1.0. @petrelharp has already created a PR to test this, and it does seem to work fine; see #565.
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The next SLiM release should update to tskit 1.1.0. @petrelharp has already created a PR to test this, and it does seem to work fine; see #565.