v0.3.2 — Add some readline shortcuts

Add the following shortcuts (see #28):

• Ctrl-A / Ctrl-E — Go to beginning/end of command.
• Ctrl-B / Ctrl-F — Move backward/forward by one character (same as Left/Right).
• Ctrl-K / Ctrl-Y — Kill from cursor to EOL. / Yank (paste) last kill at cursor.

Those features were contributed by @cmacrae — thanks! ❤️