[FD] Integer overflow in Tracto ERC20

[姚志华]

Hello,I found an integer overflow in increaseApproval function.And it doesn't 
use the safe function to add value.
code addresss:
https://etherscan.io/address/0x30ceCB5461A449A90081F5a5F55db4e048397BAB
vuln code:

    function increaseApproval (address _spender, uint _addedValue) 
        returns (bool success) {
        //allowed[msg.sender][_spender] = 
allowed[msg.sender][_spender].add(_addedValue);
        allowed[msg.sender][_spender] += _addedValue;   //integer overflow
        Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
        return true;
      }
This issue has been already applied for CVE-2018-14063


The issue link :
https://github.com/tracto2/Tracto-ERC20/issues/1

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