Feature
* feat: prevent sending empty answer and handle ctrl + c in reading (29)
* feat: prevent sending empty answer and handle ctrl + c
User can&39;t send empty meaning or reading. A system beep is sent when try to do so.
User can now ctrl + c out of reading questions.
We used the raw.read in linux,osx getch method since windows getch returned binary as well. ([`732b5c2`](https://github.com/ajite/hebikani/commit/732b5c2619da0b6a6942a857158a1875d1f756d8))