Last line is not highlighted

[jonasw234]

When creating a minimal working example for #10 I noticed that the last line is never highlighted.
Same test file:

select me
and me
|and me
and me
last one
not me

Where | marks the cursor position.
Marking a range with :0,$ doesn’t highlight anything, :1,$ highlights everything up to but not including the last line and even explicitly using :1,6 doesn’t highlight the last line.

[krishnakumarg1984]

I also face this same issue.