Add ctrl-d to exit

Fixes #481

README.md

@@ -98,6 +98,8 @@ Notes:
 
 - If you are halfway through typing a command but change your mind, hit **alt-#** to add a `#` at the beginning and enter it as a comment (or use **ctrl-a**, **#**, **enter**). You can then return to it later via command history.
 
+- Use **ctrl-d** instead of typing `exit`; especially helpful on remote ssh sessions.
+
 - Use `xargs` (or `parallel`). It's very powerful. Note you can control how many items execute per line (`-L`) as well as parallelism (`-P`). If you're not sure if it'll do the right thing, use `xargs echo` first. Also, `-I{}` is handy. Examples:
 ```bash
       find . -name '*.py' | xargs grep some_function