Same color for background and border on bordered table with light head

Created by: guizoxxv

In Bootstrap v4.0.0-beta.2 if I use a .table-bordered <table> with a .thead-light <thead> the background-color and border-color CSS attributes are the same - #e9ecef so you won't see borders on the head. It is easy to fix but I believe it these colors should be different by default as adding .table-bordered should apply visible borders all over the table. Maybe a different border color for .thead-light inside .table-bordered or a different color for .thead-light (witch is my fix - #e9fcef).

Demo.