Ellipsis: Replace "..." by "…" (U+2026) ?

[samber]

suggested by @NathanBaulch in #470

[ccoVeille]

I also prefer using Unicode ellipsis, but I'm a not afraid about the consequence about such a change

maybe you could provide a way to provide the character via a parameter (or via another method), but then I'm a bit afraid no one will use the Unicode Ellipsis unless there is one method for 3 dots and one for Ellipsis.

But the public code using lo.Elipsis is very limited.
https://github.com/search?q=%22lo.elipse%22+language%3AGo+&type=code

So I would say go for using Unicode one