Remove unnecessary else - statement

Signed-off-by: Niko Rosvall <niko@ideabyte.net>
Add information about Bash history expand feature.

On some terminal emulators Bash history expand feature might cause
problems with Memo if you want to use exclamation marks in your note
content.  However, this is not a bug. It's a feature of Bash.

Signed-off-by: Niko Rosvall <niko@ideabyte.net>