Release v0.1.1 - hotfixes due to `alchemiscale` 0.5.2 changes

alchemiscale 0.5.2 saw removal of the alchemiscale.keyedchain module, which was upstreamed to gufe in gufe.tokenization. We used KeyedChains here for serialization, so importing from alchemiscale broke with the latest release.

What's Changed

• Hotfixes following alchemiscale 0.5.2 release by @dotsdl in #19

Full Changelog: v0.1.0...v0.1.1