v2.0.0 - Add support for Uniswap V4

• Add support for V4 functions and features:
  • V4_INITIALIZE_POOL
  • V4_POSITION_MANAGER_CALL
    • MINT_POSITION
    • SETTLE
    • SETTLE_PAIR
    • CLOSE_CURRENCY
    • WRAP
    • UNWRAP
    • TAKE_PAIR
    • CLEAR_OR_TAKE
    • TAKE
  • V4_SWAP
    • SWAP_EXACT_IN_SINGLE
    • SWAP_EXACT_IN
    • SWAP_EXACT_OUT_SINGLE
    • SWAP_EXACT_OUT
    • SETTLE
    • SETTLE_ALL
    • TAKE_ALL
    • TAKE_PORTION
    • TAKE
  • Pool Key, Path and Id encoding
• Add support for PERMIT2_TRANSFER_FROM
• Custom contract error decoding
• Encoding refactoring
• Remove support for Python 3.8
• Update repository picture
• Update default router address to Mainnet's one
• Add integration tests for V4 functions
• Update default router address to new Mainnet's one