Extract issue from `ghi open' after parsing [fix #81]

Otherwise, e.g., `ghi open -m 1000' will not open an issue with the
message (title) "1000", but instead will attempt to edit issue 1000
with the `-m' flag (for message editing).

Reported-by: Tomasz Durka <tomasz@durka.pl>
Signed-off-by: Stephen Celis <stephen@stephencelis.com>
Bump version

Signed-off-by: Stephen Celis <stephen@stephencelis.com>