Update bitcoin and hammersbald dependencies#47

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stevenroose wants to merge 8 commits intorust-bitcoin:masterfrom

stevenroose:bitcoin-0.26

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

Commits on Feb 5, 2021

Update to hammersbald v3 and bitcoin 0.26
stevenroose
committed

Commits on Feb 28, 2021

Respond to ping to prevent timeout

jrawsthorne
authored and
kcalvinalvin
committed
P2P: Update DNS seeds

willcl-ark
authored and
kcalvinalvin
committed
Convert ChainDB to a trait implemented by Hammersbald struct. Make hammersbald default optional dependency.

notmandatory
authored and
kcalvinalvin
committed