fix in 07_environment.html

[itfat]

In the function balance

def balance(evm):
    address = cpu.stack.pop()
    evm.stack.push(99999999999)

    evm.pc += 1
    evm.gas_dec(2600) # 100 if warm

Updated the address to evm.stack.pop(). Same is the case with calldatacopy mentioned in #14

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[shafu0x]

thanks