Merge branch 'dev'

Merge branch 'dev'

Merge branch 'dev'

Merge branch 'dev'

bump version

Merge pull request ethereum#2230 from ethereum/dev

Altair pre-release v1.1.0-alpha.1

Merge pull request ethereum#2211 from ethereum/release-0x01

[minor release] 0x01 credentials

Merge pull request ethereum#2082 from ethereum/v1.0-candidate

v1.0 release

Merge pull request ethereum#2093 from ethereum/eth1data-params

double eth1data params

Merge pull request ethereum#2057 from ethereum/dev

release v0.12.3