bump to 0.4.0.
bump to 0.4.0.

scorphus/gandalf,flaviamissi/gandalf,gleez/gandalf,marcelometal/gandalf,marcelometal/gandalf,scorphus/gandalf,gleez/gandalf,flaviamissi/gandalf,marcelometal/gandalf,tsuru/gandalf,gleez/gandalf,tsuru/gandalf