This reverts commit cd98b2c.

… version

I made a change in 1ecea2 that was meant to affect both versions, but I only
changed it in the non-async version.

It's hard to share code between a non-async and an async function.
(The only line that changes is how input is received, `input()` vs `await ainput()`,
but there's no way to make that into a "parameter" since one is async and the
other is not.)

This is to avoid conflicts with blocking IO, i.e. input() and print().
On Linux ainput() sets the O_NONBLOCK flag, which then makes input() and print() fail.

Fixes #17, #19

# Conflicts:
#	src/loveletter_cli/session.py