v0.6.0

StarkNet:

• Replace block id with block hash (not verified by the OS yet)
• Add constructor arguments to the computation of the contract's address
• Add get_transaction_receipt command to the starknet CLI
• New system calls:
  • get_contract_address - returns the address of the current contract
  • get_sequencer_address - this may be used in the future for paying fees
  • delegate_call - partial support

Cairo:

• Add dw keyword for defining constant arrays