message: Remove mentions about web3-v2 from readme
diff: - static typing - you will never call not existing method again
  - IDE support - works with any IDE supporting Typescript
  -- extendible - work with many different APIs: `ethers.js v4`, `truffle v4`, `truffle v5`, `Web3.js v1`, `Web3.js v2` or
  - you can create your own target
  +- extendible - work with many different APIs: `ethers.js v4`, `truffle v4`, `truffle v5`, `Web3.js v1` or you can create
  + your own target
  - frictionless - works with simple, JSON ABI files as well as with Truffle style ABIs
  ## Installation
  