Range Identifying

For cheese trade, range is a important sign.
This is the first version trying to identify the range.
Use 2 white lines to show the range's high and low.
Hope this helps, and welcome comment.

版本注释:

Update the function to change line colors by self-defined because while line is not suitable for white background.

版本注释:

According to feedback:
1.Add self-defined if line extension.
2.Add self-defined line-width from 1-4,default is 1.