printing doesn't work on mac

[Almenon]

When anything is printed the last character is left off.

print('hello world')

hello worl

[Almenon]

Found the problem:
https://github.com/Almenon/AREPL/blob/09dc88a3f887fc7868438f7cc85045cac8975a39/src/evaluators.js#L152
https://github.com/Almenon/AREPL/blob/09dc88a3f887fc7868438f7cc85045cac8975a39/src/evaluators.js#L153

Mac doesn't have \r, that's just a windows thing. Darnit windows!

If I had a used a defensive programming style (by checking for existance of \r before removing) I could have avoided this bug. Anyways, fix is very easy:

	if(results.endsWith('\r')) results = results.slice(0, results.length-1);