Fix from str import#339

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tcharding wants to merge 2 commits intobitcoindevkit:masterfrom

tcharding:fix-from-str-import

Commits on May 6, 2021

Merge commit 'refs/pull/336/head' of github.com:bitcoindevkit/bdk

afilini
authored and
tcharding
committed
Use FromStr from std instead of bitcoin
tcharding
committed