Tab completion doesn't work with Julia 1.11

[hhaensel]

Currently line completion is not working with Julia 1.11 due to the additional keyword arg hint in complete_line().
Adding the keyword with a default value fixes the problem. The keyword doesn't have any function except matching the dispatch call.
I'll submit a PR.

[hhaensel]

Here it is: #75

[hhaensel]

@c42f who's the right person to address/decide?