Fixed completing executables (#353)
Fixed completing executables (#353)

* Fixed completing executables

The problem was that for any filename "foo", `readln` would check to see
if either it exists, or if the parent exists. Which means if you're
trying to complete _any_ executable, it thinks its a file because the
"parent" is the current directory.

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bheesham/ion,redox-os/ion,jwbowen/ion,bheesham/ion,jwbowen/ion,redox-os/ion,redox-os/ion