Automated \end{} for typed \begin{}?

[vvkisil]

I had installed texlab under Devuan+Emacs and its work as expected, many thanks for your excellent job!
However, the first texlab's README.md animation shows that \begin{document} is automatically closed by the matching \end{document} and I do not have such a behavior in my setup.
Can someone advise me which additional bit of software or a variable's setting is required for this?

[vvkisil]

It seems, that Emacs package yasnippet provides this functionality.