Merge pull request ethereum#4036 from ethereum/dev

Release v1.5.0-alpha.10

Merge pull request ethereum#3982 from ethereum/dev

Release v1.5.0-alpha.9

Merge pull request ethereum#3965 from ethereum/dev

Release v1.5.0-alpha.8

Merge pull request ethereum#3954 from ethereum/dev

Release v1.5.0-alpha.7

Merge pull request ethereum#3920 from ethereum/dev

Merge pull request ethereum#3891 from ethereum/bump-version

bump version to 1.5.0-alpha.5

Merge pull request ethereum#3868 from mkalinin/fix-consolidation

Fix off-by-one in process_pending_consolidations

Merge pull request ethereum#3786 from ethereum/dev

release v1.5.0-alpha.3

Merge pull request ethereum#3749 from ethereum/dev

Release `v1.5.0-alpha.2`

Merge pull request ethereum#3733 from ethereum/dev

patch for v1.5.0-alpha.1 release