Replacing if statement with ternary operator (#198)

* replacing if with ternary operator

* Update contracts/UFragments.sol

Author: aalavandhan

contracts/UFragments.sol

@@ -358,12 +358,7 @@ contract UFragments is ERC20Detailed, Ownable {
      */
     function decreaseAllowance(address spender, uint256 subtractedValue) external returns (bool) {
         uint256 oldValue = _allowedFragments[msg.sender][spender];
-        uint256 newValue;
-        if (subtractedValue >= oldValue) {
-            newValue = 0;
-        } else {
-            newValue = oldValue.sub(subtractedValue);
-        }
+        uint256 newValue = (subtractedValue >= oldValue) ? 0 : oldValue.sub(subtractedValue);
 
         _allowedFragments[msg.sender][spender] = newValue;
         emit Approval(msg.sender, spender, newValue);