v4.0.0

• feat: create SimpleERC20

• chore: bump version

• feat: create mintable and burnable token

• feat: add different token types

• feat: make standard token able to set decimals

• feat: move test folder

• chore: update to solidity 0.7.3

• feat: add powerful token

• feat: add the fee receiver

• feat: remove tokenrecover from common

• feat: add service receiver

• style: lint js

• feat: add service dist and analysis

• feat: use service payer also for simple token

• feat: use solc 0.7.4

• chore: update dependencies

• feat: update dependencies

• chore: downgrade truffe