Release - 1.2.2 (web3#3147)

* versions manually updated 

* branches to contribute too updated in root readme

* build pipeline changes reverted

* karmaconf added to jshintignore

* release commit

Merge pull request web3#3006 from ethereum/release/2.0.0-alpha.1

Release - 2.0.0-alpha.1

Merge pull request web3#3004 from ethereum/release/1.2.1

Release - 1.2.1

Merge pull request web3#2905 from ethereum/release/1.0

Release - 1.0

Merge pull request web3#2906 from ethereum/release/2.0-alpha

Release - 2.0.0-alpha

Merge pull request web3#2803 from ethereum/release/1.0.0-beta.55

Release - 1.0.0-beta.55

Merge pull request web3#2774 from ethereum/release/1.0.0-beta.54

Release - 1.0.0-beta.54

Merge pull request web3#2751 from ethereum/release/1.0.0-beta.53

Release - 1.0.0-beta.53