Merge pull request bnb-chain#41 from binance-chain/branch_1.0.3

[R4R]prepare release 1.0.3

Merge pull request bnb-chain#32 from binance-chain/releasev1.0.2

[R4R]prepare for release 1.0.2

Merge pull request bnb-chain#27 from binance-chain/1.0.1.beta.2

[R4R]add niels fork

Merge pull request bnb-chain#24 from binance-chain/develop

[R4R] prepare for release 1.0.1-beta

prepare for 1.0.0-beta.1 (bnb-chain#20)

add chain id into sign bytes to avoid replay attack (bnb-chain#18)

add chain id into sign bytes to avoid replay attack (bnb-chain#18)

add key features to the readme