Describe the bug
The vertical alignment of the Box in the right will be broken if multi line strings are used.

To Reproduce
Steps to reproduce the behavior:

Box := box.New(box.Config{Px: 2, Py: 5, Type: Single})
Box.Println(`Box CLI Maker 
		foo foobar`, `Highly Customized Terminal Box Maker  
		bar`)

Expected behavior
The vertical alignment shouldn't break.

Screenshots / Logs
If applicable, add screenshots or logs to help explain your problem.

Versions (please complete the following information, if relevant):

• Software version: v1.3.2
• OS: Windows 10
• Golang version: 1.15.3