Upgrade bitcoin version and remove lightning#40

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jrawsthorne wants to merge 4 commits intorust-bitcoin:masterfrom jrawsthorne:upgrade-bitcoin

+82-208

Commits on Aug 6, 2020

Upgrade bitcoin version, fix types, remove lightning
jrawsthorne
committed

Commits on Aug 26, 2020

Commits on Aug 31, 2020

Update to latest hammersbald changes
jrawsthorne
committed