Merge pull request EOSIO#6711 from EOSIO/merge-1.6.1-master

Merge 1.6.1 master

Merge pull request EOSIO#6706 from EOSIO/bump-version-to-1.5.5

Bump version to 1.5.5

Merge pull request EOSIO#6613 from EOSIO/release/1.6.x

Release 1.6.0

Merge pull request EOSIO#6608 from EOSIO/feature/bump-version-to-1.5.4

Bump version to 1.5.4

Merge pull request EOSIO#6607 from EOSIO/feature/bump-version-to-1.4.6

Bump version to 1.4.6

Merge pull request EOSIO#6548 from EOSIO/feature/bump-version-to-1.6.…

…0-rc2

bump version to 1.6.0-rc2

Merge pull request EOSIO#6547 from EOSIO/release/1.5.x

Release 1.5.3

Merge pull request EOSIO#6502 from EOSIO/feature/bump-version-to-1.6.…

…0-rc1

bump version to 1.6.0-rc1

Merge pull request EOSIO#6504 from EOSIO/release/1.5.x

Release 1.5.2

Merge pull request EOSIO#6482 from EOSIO/release/1.5.x

Release 1.5.1