LGT

In the contract `LGToken`, there is no upper limit for the fee rate. Misuse of these fee setting functions could damage the whole tokenomics. For example, the owner can set the fee rate to more than 100% to cause all transactions to revert. For example : ```solidity=723 function setLiquidityFee(uint256 val) public onlyOwner { liquidityFee = val; } ``` ```solidity=807 function takeAllFee(address from,uint256 amount) private returns(uint256 amountAfter) { ... uint256 LFee = amount.mul(liquidityFee).div(100); AmountLiquidityFee += LFee; amountAfter = amountAfter.sub(LFee); ... ```