Fix incorrect width computation for text that can't wrap

Some reproductions of the issue: https://codesandbox.io/s/react-wrap-balancer-bug-ubbizi

The problem is that if the text can't wrap, the container's height will never change as we shrink the wrapper. So we keep shrinking the wrapper, never observe a height change, and end up with a width lower than the minimum required to not overflow the container.

I solved it by making sure lower is no less than the minimum width necessary to fit the contents (see scrollWidth documentation).

Ideally you wouldn't give react-wrap-balancer text that can't wrap in the first place, but sometimes you're getting arbitrary titles from somewhere and you don't know if they are single words or have non-breaking spaces so we should probably handle this case in the package.

shuding / react-wrap-balancer

Fix incorrect width computation for text that can't wrap #57