Linenoise returned nil [IOError] / Allow Ctrl+D to quit the Interactive shell

IPython for example allows Ctrl + D to quit it.

Doing that in INim gives:

```text
INim 0.2.0
Nim Compiler Version 0.18.1 [Linux: amd64] at /home/kmodi/stowed/bin/nim
>>>
inim.nim(141)            inim
inim.nim(78)             runForever
rdstdin.nim(83)          readLineFromStdin
Error: unhandled exception: Linenoise returned nil [IOError]
```