Upgrade repl to get `Ctrl + /` annotations and jsx support

[warmthsea]

https://github.com/vuejs/repl

[warmthsea]

Ctrl + / annotation is not currently supported

[sxzz]

PR is welcome.

[btea]

#273 resolved.

[sxzz]

It doesn't seem to be fixed, even in play.vuejs.org.