Version 0.1.1
Add forwarding support

This change introduces a new helper funcion, read_draft.
Do refactoring

This change rewrites the Olm::App.create_message method using the
read_draft helper method.
Make the To field in forwarding mode optional
Fix a bug in Olm::App#update_message_body

It causes nilError.
Do refactoring

It merges olm-do-command-buf with olm-draft-reply-all-do-command.
Version bump to 0.1.3