Chore/unified rust edition to 2021 #204
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https://github.com/CosmWasm/cosmwasm/blob/88762e8a9a34e63ebc2d091752eef5dc106a3bc2/CHANGELOG-pre1.0.0.md
cosmwasm has set rust-edition to 2021, so it probably ok for us to set edition to 2021 for all our packages and contracts